Merge branch 'master' into hide-container-impl

33 files changed, 312 insertions, 156 deletions

diff --git a/src/nvim/api/ui.c b/src/nvim/api/ui.c
index a9eaccfac5..35508fde6b 100644
--- a/src/nvim/api/ui.c
+++ b/src/nvim/api/ui.c
@@ -93,6 +93,7 @@ void nvim_ui_attach(uint64_t channel_id, Integer width, Integer height,
   ui->suspend = remote_ui_suspend;
   ui->set_title = remote_ui_set_title;
   ui->set_icon = remote_ui_set_icon;
+  ui->option_set = remote_ui_option_set;
   ui->event = remote_ui_event;
 
   memset(ui->ui_ext, 0, sizeof(ui->ui_ext));
diff --git a/src/nvim/api/ui_events.in.h b/src/nvim/api/ui_events.in.h
index 847b21072a..3d2253e918 100644
--- a/src/nvim/api/ui_events.in.h
+++ b/src/nvim/api/ui_events.in.h
@@ -58,6 +58,8 @@ void set_title(String title)
   FUNC_API_SINCE(3);
 void set_icon(String icon)
   FUNC_API_SINCE(3);
+void option_set(String name, Object value)
+  FUNC_API_SINCE(4) FUNC_API_BRIDGE_IMPL;
 
 void popupmenu_show(Array items, Integer selected, Integer row, Integer col)
   FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
diff --git a/src/nvim/edit.c b/src/nvim/edit.c
index 2fa4a52387..649357c7ea 100644
--- a/src/nvim/edit.c
+++ b/src/nvim/edit.c
@@ -1927,7 +1927,7 @@ bool vim_is_ctrl_x_key(int c)
   case CTRL_X_EVAL:
     return (c == Ctrl_P || c == Ctrl_N);
   }
-  EMSG(_(e_internal));
+  internal_error("vim_is_ctrl_x_key()");
   return false;
 }
 
@@ -4681,7 +4681,7 @@ static int ins_complete(int c, bool enable_pum)
       line = ml_get(curwin->w_cursor.lnum);
       compl_pattern = vim_strnsave(line + compl_col, compl_length);
     } else {
-      EMSG2(_(e_intern2), "ins_complete()");
+      internal_error("ins_complete()");
       return FAIL;
     }
 
diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index 3aaa5f349d..74b0cdc746 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -1099,10 +1099,11 @@ static void restore_vimvar(int idx, typval_T *save_tv)
   vimvars[idx].vv_tv = *save_tv;
   if (vimvars[idx].vv_type == VAR_UNKNOWN) {
     hi = hash_find(&vimvarht, vimvars[idx].vv_di.di_key);
-    if (HASHITEM_EMPTY(hi))
-      EMSG2(_(e_intern2), "restore_vimvar()");
-    else
+    if (HASHITEM_EMPTY(hi)) {
+      internal_error("restore_vimvar()");
+    } else {
       hash_remove(&vimvarht, hi);
+    }
   }
 }
 
@@ -1570,7 +1571,7 @@ ex_let_vars (
       }
       break;
     } else if (*arg != ',' && *arg != ']') {
-      EMSG2(_(e_intern2), "ex_let_vars()");
+      internal_error("ex_let_vars()");
       return FAIL;
     }
   }
@@ -2969,7 +2970,7 @@ int do_unlet(const char *const name, const size_t name_len, const int forceit)
       d = di->di_tv.vval.v_dict;
     }
     if (d == NULL) {
-      EMSG2(_(e_intern2), "do_unlet()");
+      internal_error("do_unlet()");
       return FAIL;
     }
     hashitem_T *hi = hash_find(ht, (const char_u *)varname);
@@ -7985,7 +7986,7 @@ static void f_empty(typval_T *argvars, typval_T *rettv, FunPtr fptr)
       break;
     }
     case VAR_UNKNOWN: {
-      EMSG2(_(e_intern2), "f_empty(UNKNOWN)");
+      internal_error("f_empty(UNKNOWN)");
       break;
     }
   }
@@ -17149,7 +17150,7 @@ static void f_type(typval_T *argvars, typval_T *rettv, FunPtr fptr)
       break;
     }
     case VAR_UNKNOWN: {
-      EMSG2(_(e_intern2), "f_type(UNKNOWN)");
+      internal_error("f_type(UNKNOWN)");
       break;
     }
   }
@@ -18999,7 +19000,7 @@ static void set_var(const char *name, const size_t name_len, typval_T *const tv,
         }
         return;
       } else if (v->di_tv.v_type != tv->v_type) {
-        EMSG2(_(e_intern2), "set_var()");
+        internal_error("set_var()");
       }
     }
 
@@ -19266,7 +19267,7 @@ int var_item_copy(const vimconv_T *const conv,
     }
     break;
   case VAR_UNKNOWN:
-    EMSG2(_(e_intern2), "var_item_copy(UNKNOWN)");
+    internal_error("var_item_copy(UNKNOWN)");
     ret = FAIL;
   }
   --recurse;
@@ -20954,11 +20955,11 @@ void func_unref(char_u *name)
   if (fp == NULL && isdigit(*name)) {
 #ifdef EXITFREE
     if (!entered_free_all_mem) {
-      EMSG2(_(e_intern2), "func_unref()");
+      internal_error("func_unref()");
       abort();
     }
 #else
-      EMSG2(_(e_intern2), "func_unref()");
+      internal_error("func_unref()");
       abort();
 #endif
   }
@@ -20997,7 +20998,7 @@ void func_ref(char_u *name)
   } else if (isdigit(*name)) {
     // Only give an error for a numbered function.
     // Fail silently, when named or lambda function isn't found.
-    EMSG2(_(e_intern2), "func_ref()");
+    internal_error("func_ref()");
   }
 }
 
diff --git a/src/nvim/eval/encode.c b/src/nvim/eval/encode.c
index b7af102681..31779a544f 100644
--- a/src/nvim/eval/encode.c
+++ b/src/nvim/eval/encode.c
@@ -346,7 +346,7 @@ int encode_read_from_list(ListReaderState *const state, char *const buf,
     do { \
       const char *const fun_ = (const char *)(fun); \
       if (fun_ == NULL) { \
-        EMSG2(_(e_intern2), "string(): NULL function name"); \
+        internal_error("string(): NULL function name"); \
         ga_concat(gap, "function(NULL"); \
       } else { \
         ga_concat(gap, "function("); \
diff --git a/src/nvim/eval/typval.c b/src/nvim/eval/typval.c
index 5040695b09..53c56d0ffd 100644
--- a/src/nvim/eval/typval.c
+++ b/src/nvim/eval/typval.c
@@ -1880,14 +1880,20 @@ static inline void _nothing_conv_func_end(typval_T *const tv, const int copyID)
       tv->v_lock = VAR_UNLOCKED; \
     } while (0)
 
+static inline void _nothing_conv_empty_dict(typval_T *const tv,
+                                            dict_T **const dictp)
+  FUNC_ATTR_ALWAYS_INLINE FUNC_ATTR_NONNULL_ARG(2)
+{
+  tv_dict_unref(*dictp);
+  *dictp = NULL;
+  if (tv != NULL) {
+    tv->v_lock = VAR_UNLOCKED;
+  }
+}
 #define TYPVAL_ENCODE_CONV_EMPTY_DICT(tv, dict) \
     do { \
       assert((void *)&dict != (void *)&TYPVAL_ENCODE_NODICT_VAR); \
-      tv_dict_unref((dict_T *)dict); \
-      *((dict_T **)&dict) = NULL; \
-      if (tv != NULL) { \
-        ((typval_T *)tv)->v_lock = VAR_UNLOCKED; \
-      } \
+      _nothing_conv_empty_dict(tv, ((dict_T **)&dict)); \
     } while (0)
 
 static inline int _nothing_conv_real_list_after_start(
diff --git a/src/nvim/eval/typval_encode.c.h b/src/nvim/eval/typval_encode.c.h
index e9531178ef..f2d0d7265f 100644
--- a/src/nvim/eval/typval_encode.c.h
+++ b/src/nvim/eval/typval_encode.c.h
@@ -624,7 +624,7 @@ _convert_one_value_regular_dict: {}
       break;
     }
     case VAR_UNKNOWN: {
-      EMSG2(_(e_intern2), STR(_TYPVAL_ENCODE_CONVERT_ONE_VALUE) "()");
+      internal_error(STR(_TYPVAL_ENCODE_CONVERT_ONE_VALUE) "()");
       return FAIL;
     }
   }
diff --git a/src/nvim/ex_eval.c b/src/nvim/ex_eval.c
index 9037b3c151..4010a088c8 100644
--- a/src/nvim/ex_eval.c
+++ b/src/nvim/ex_eval.c
@@ -517,7 +517,7 @@ static void discard_exception(except_T *excp, int was_finished)
   char_u              *saved_IObuff;
 
   if (excp == NULL) {
-    EMSG(_(e_internal));
+    internal_error("discard_exception()");
     return;
   }
 
@@ -619,8 +619,9 @@ static void catch_exception(except_T *excp)
  */
 static void finish_exception(except_T *excp)
 {
-  if (excp != caught_stack)
-    EMSG(_(e_internal));
+  if (excp != caught_stack) {
+    internal_error("finish_exception()");
+  }
   caught_stack = caught_stack->caught;
   if (caught_stack != NULL) {
     set_vim_var_string(VV_EXCEPTION, (char *) caught_stack->value, -1);
@@ -1422,8 +1423,9 @@ void ex_catch(exarg_T *eap)
        * ":endtry" or when the catch clause is left by a ":continue",
        * ":break", ":return", ":finish", error, interrupt, or another
        * exception. */
-      if (cstack->cs_exception[cstack->cs_idx] != current_exception)
-        EMSG(_(e_internal));
+      if (cstack->cs_exception[cstack->cs_idx] != current_exception) {
+        internal_error("ex_catch()");
+      }
     } else {
       /*
        * If there is a preceding catch clause and it caught the exception,
@@ -1547,7 +1549,7 @@ void ex_finally(exarg_T *eap)
          * exception will be discarded. */
         if (did_throw && cstack->cs_exception[cstack->cs_idx]
             != current_exception)
-          EMSG(_(e_internal));
+          internal_error("ex_finally()");
       }
 
       /*
diff --git a/src/nvim/generators/gen_api_ui_events.lua b/src/nvim/generators/gen_api_ui_events.lua
index d2b90db707..2666ca6e6f 100644
--- a/src/nvim/generators/gen_api_ui_events.lua
+++ b/src/nvim/generators/gen_api_ui_events.lua
@@ -37,7 +37,7 @@ function write_arglist(output, ev, need_copy)
   for j = 1, #ev.parameters do
     local param = ev.parameters[j]
     local kind = string.upper(param[1])
-    local do_copy = need_copy and (kind == "ARRAY" or kind == "DICTIONARY" or kind == "STRING")
+    local do_copy = need_copy and (kind == "ARRAY" or kind == "DICTIONARY" or kind == "STRING" or kind == "OBJECT")
     output:write('  ADD(args, ')
     if do_copy then
       output:write('copy_object(')
@@ -91,7 +91,7 @@ for i = 1, #events do
           recv_cleanup = recv_cleanup..'  api_free_string('..param[2]..');\n'
           argc = argc+2
         elseif param[1] == 'Array' then
-          send = send..'  Array copy_'..param[2]..' = copy_array('..param[2]..');\n'
+          send = send..'  Array '..copy..' = copy_array('..param[2]..');\n'
           argv = argv..', '..copy..'.items, INT2PTR('..copy..'.size)'
           recv = (recv..'  Array '..param[2]..
                           ' = (Array){.items = argv['..argc..'],'..
@@ -99,6 +99,15 @@ for i = 1, #events do
           recv_argv = recv_argv..', '..param[2]
           recv_cleanup = recv_cleanup..'  api_free_array('..param[2]..');\n'
           argc = argc+2
+        elseif param[1] == 'Object' then
+          send = send..'  Object *'..copy..' = xmalloc(sizeof(Object));\n'
+          send = send..'  *'..copy..' = copy_object('..param[2]..');\n'
+          argv = argv..', '..copy
+          recv = recv..'  Object '..param[2]..' = *(Object *)argv['..argc..'];\n'
+          recv_argv = recv_argv..', '..param[2]
+          recv_cleanup = (recv_cleanup..'  api_free_object('..param[2]..');\n'..
+                          '  xfree(argv['..argc..']);\n')
+          argc = argc+1
         elseif param[1] == 'Integer' or param[1] == 'Boolean' then
           argv = argv..', INT2PTR('..param[2]..')'
           recv_argv = recv_argv..', PTR2INT(argv['..argc..'])'
@@ -119,7 +128,7 @@ for i = 1, #events do
       write_signature(bridge_output, ev, 'UI *ui')
       bridge_output:write('\n{\n')
       bridge_output:write(send)
-      bridge_output:write('  UI_BRIDGE_CALL(ui, '..ev.name..', '..argc..', ui'..argv..');\n}\n')
+      bridge_output:write('  UI_BRIDGE_CALL(ui, '..ev.name..', '..argc..', ui'..argv..');\n}\n\n')
     end
   end
 
diff --git a/src/nvim/generators/gen_options.lua b/src/nvim/generators/gen_options.lua
index 36562c0be9..fdc00d5dc0 100644
--- a/src/nvim/generators/gen_options.lua
+++ b/src/nvim/generators/gen_options.lua
@@ -36,6 +36,7 @@ local redraw_flags={
   all_windows='P_RALL',
   everything='P_RCLR',
   curswant='P_CURSWANT',
+  ui_option='P_UI_OPTION',
 }
 
 local list_flags={
diff --git a/src/nvim/getchar.c b/src/nvim/getchar.c
index 4f8a8528a0..1b5d3472ab 100644
--- a/src/nvim/getchar.c
+++ b/src/nvim/getchar.c
@@ -254,16 +254,17 @@ static void add_buff(buffheader_T *const buf, const char *const s,
     return;
   }
 
-  if (buf->bh_first.b_next == NULL) {   /* first add to list */
+  if (buf->bh_first.b_next == NULL) {  // first add to list
     buf->bh_space = 0;
     buf->bh_curr = &(buf->bh_first);
-  } else if (buf->bh_curr == NULL) {  /* buffer has already been read */
-    EMSG(_("E222: Add to read buffer"));
+  } else if (buf->bh_curr == NULL) {  // buffer has already been read
+    IEMSG(_("E222: Add to read buffer"));
     return;
-  } else if (buf->bh_index != 0)
+  } else if (buf->bh_index != 0) {
     memmove(buf->bh_first.b_next->b_str,
-        buf->bh_first.b_next->b_str + buf->bh_index,
-        STRLEN(buf->bh_first.b_next->b_str + buf->bh_index) + 1);
+            buf->bh_first.b_next->b_str + buf->bh_index,
+            STRLEN(buf->bh_first.b_next->b_str + buf->bh_index) + 1);
+  }
   buf->bh_index = 0;
 
   size_t len;
@@ -1152,14 +1153,16 @@ void alloc_typebuf(void)
  */
 void free_typebuf(void)
 {
-  if (typebuf.tb_buf == typebuf_init)
-    EMSG2(_(e_intern2), "Free typebuf 1");
-  else
+  if (typebuf.tb_buf == typebuf_init) {
+    internal_error("Free typebuf 1");
+  } else {
     xfree(typebuf.tb_buf);
-  if (typebuf.tb_noremap == noremapbuf_init)
-    EMSG2(_(e_intern2), "Free typebuf 2");
-  else
+  }
+  if (typebuf.tb_noremap == noremapbuf_init) {
+    internal_error("Free typebuf 2");
+  } else {
     xfree(typebuf.tb_noremap);
+  }
 }
 
 /*
@@ -3905,7 +3908,7 @@ makemap (
           c1 = 't';
           break;
         default:
-          EMSG(_("E228: makemap: Illegal mode"));
+          IEMSG(_("E228: makemap: Illegal mode"));
           return FAIL;
         }
         do {            /* do this twice if c2 is set, 3 times with c3 */
diff --git a/src/nvim/globals.h b/src/nvim/globals.h
index ef56954aa0..dd216f177f 100644
--- a/src/nvim/globals.h
+++ b/src/nvim/globals.h
@@ -1043,6 +1043,7 @@ EXTERN char_u e_for[] INIT(= N_("E588: :endfor without :for"));
 EXTERN char_u e_exists[] INIT(= N_("E13: File exists (add ! to override)"));
 EXTERN char_u e_failed[] INIT(= N_("E472: Command failed"));
 EXTERN char_u e_internal[] INIT(= N_("E473: Internal error"));
+EXTERN char_u e_intern2[] INIT(= N_("E685: Internal error: %s"));
 EXTERN char_u e_interr[] INIT(= N_("Interrupted"));
 EXTERN char_u e_invaddr[] INIT(= N_("E14: Invalid address"));
 EXTERN char_u e_invarg[] INIT(= N_("E474: Invalid argument"));
@@ -1134,7 +1135,6 @@ EXTERN char_u e_write[] INIT(= N_("E80: Error while writing"));
 EXTERN char_u e_zerocount[] INIT(= N_("E939: Positive count required"));
 EXTERN char_u e_usingsid[] INIT(= N_(
     "E81: Using <SID> not in a script context"));
-EXTERN char_u e_intern2[] INIT(= N_("E685: Internal error: %s"));
 EXTERN char_u e_maxmempat[] INIT(= N_(
         "E363: pattern uses more memory than 'maxmempattern'"));
 EXTERN char_u e_emptybuf[] INIT(= N_("E749: empty buffer"));
diff --git a/src/nvim/hashtab.c b/src/nvim/hashtab.c
index 3397788b00..526bc284a4 100644
--- a/src/nvim/hashtab.c
+++ b/src/nvim/hashtab.c
@@ -208,7 +208,7 @@ int hash_add(hashtab_T *ht, char_u *key)
   hash_T hash = hash_hash(key);
   hashitem_T *hi = hash_lookup(ht, (const char *)key, STRLEN(key), hash);
   if (!HASHITEM_EMPTY(hi)) {
-    EMSG2(_(e_intern2), "hash_add()");
+    internal_error("hash_add()");
     return FAIL;
   }
   hash_add_item(ht, hi, key, hash);
diff --git a/src/nvim/memfile.c b/src/nvim/memfile.c
index 4428dd42aa..4eeba12b87 100644
--- a/src/nvim/memfile.c
+++ b/src/nvim/memfile.c
@@ -376,8 +376,9 @@ void mf_put(memfile_T *mfp, bhdr_T *hp, bool dirty, bool infile)
 {
   unsigned flags = hp->bh_flags;
 
-  if ((flags & BH_LOCKED) == 0)
-    EMSG(_("E293: block was not locked"));
+  if ((flags & BH_LOCKED) == 0) {
+    IEMSG(_("E293: block was not locked"));
+  }
   flags &= ~BH_LOCKED;
   if (dirty) {
     flags |= BH_DIRTY;
diff --git a/src/nvim/memline.c b/src/nvim/memline.c
index f28a9e60f4..80775c607d 100644
--- a/src/nvim/memline.c
+++ b/src/nvim/memline.c
@@ -293,7 +293,7 @@ int ml_open(buf_T *buf)
    */
   hp = mf_new(mfp, false, 1);
   if (hp->bh_bnum != 0) {
-    EMSG(_("E298: Didn't get block nr 0?"));
+    IEMSG(_("E298: Didn't get block nr 0?"));
     goto error;
   }
   b0p = hp->bh_data;
@@ -335,7 +335,7 @@ int ml_open(buf_T *buf)
   if ((hp = ml_new_ptr(mfp)) == NULL)
     goto error;
   if (hp->bh_bnum != 1) {
-    EMSG(_("E298: Didn't get block nr 1?"));
+    IEMSG(_("E298: Didn't get block nr 1?"));
     goto error;
   }
   pp = hp->bh_data;
@@ -351,7 +351,7 @@ int ml_open(buf_T *buf)
    */
   hp = ml_new_data(mfp, FALSE, 1);
   if (hp->bh_bnum != 2) {
-    EMSG(_("E298: Didn't get block nr 2?"));
+    IEMSG(_("E298: Didn't get block nr 2?"));
     goto error;
   }
 
@@ -635,13 +635,14 @@ static void ml_upd_block0(buf_T *buf, upd_block0_T what)
   if (mfp == NULL || (hp = mf_get(mfp, 0, 1)) == NULL)
     return;
   b0p = hp->bh_data;
-  if (ml_check_b0_id(b0p) == FAIL)
-    EMSG(_("E304: ml_upd_block0(): Didn't get block 0??"));
-  else {
-    if (what == UB_FNAME)
+  if (ml_check_b0_id(b0p) == FAIL) {
+    IEMSG(_("E304: ml_upd_block0(): Didn't get block 0??"));
+  } else {
+    if (what == UB_FNAME) {
       set_b0_fname(b0p, buf);
-    else     /* what == UB_SAME_DIR */
+    } else {    // what == UB_SAME_DIR
       set_b0_dir_flag(b0p, buf);
+    }
   }
   mf_put(mfp, hp, true, false);
 }
@@ -1742,11 +1743,11 @@ ml_get_buf (
 
   if (lnum > buf->b_ml.ml_line_count) { /* invalid line number */
     if (recursive == 0) {
-      /* Avoid giving this message for a recursive call, may happen when
-       * the GUI redraws part of the text. */
-      ++recursive;
-      EMSGN(_("E315: ml_get: invalid lnum: %" PRId64), lnum);
-      --recursive;
+      // Avoid giving this message for a recursive call, may happen when
+      // the GUI redraws part of the text.
+      recursive++;
+      IEMSGN(_("E315: ml_get: invalid lnum: %" PRId64), lnum);
+      recursive--;
     }
 errorret:
     STRCPY(IObuff, "???");
@@ -1774,11 +1775,11 @@ errorret:
      */
     if ((hp = ml_find_line(buf, lnum, ML_FIND)) == NULL) {
       if (recursive == 0) {
-        /* Avoid giving this message for a recursive call, may happen
-         * when the GUI redraws part of the text. */
-        ++recursive;
-        EMSGN(_("E316: ml_get: cannot find line %" PRId64), lnum);
-        --recursive;
+        // Avoid giving this message for a recursive call, may happen
+        // when the GUI redraws part of the text.
+        recursive++;
+        IEMSGN(_("E316: ml_get: cannot find line %" PRId64), lnum);
+        recursive--;
       }
       goto errorret;
     }
@@ -2162,7 +2163,7 @@ ml_append_int (
         return FAIL;
       pp = hp->bh_data;         /* must be pointer block */
       if (pp->pb_id != PTR_ID) {
-        EMSG(_("E317: pointer block id wrong 3"));
+        IEMSG(_("E317: pointer block id wrong 3"));
         mf_put(mfp, hp, false, false);
         return FAIL;
       }
@@ -2295,8 +2296,8 @@ ml_append_int (
      * Safety check: fallen out of for loop?
      */
     if (stack_idx < 0) {
-      EMSG(_("E318: Updated too many blocks?"));
-      buf->b_ml.ml_stack_top = 0;       /* invalidate stack */
+      IEMSG(_("E318: Updated too many blocks?"));
+      buf->b_ml.ml_stack_top = 0;       // invalidate stack
     }
   }
 
@@ -2435,7 +2436,7 @@ static int ml_delete_int(buf_T *buf, linenr_T lnum, int message)
         return FAIL;
       pp = hp->bh_data;         /* must be pointer block */
       if (pp->pb_id != PTR_ID) {
-        EMSG(_("E317: pointer block id wrong 4"));
+        IEMSG(_("E317: pointer block id wrong 4"));
         mf_put(mfp, hp, false, false);
         return FAIL;
       }
@@ -2630,9 +2631,9 @@ static void ml_flush_line(buf_T *buf)
     new_line = buf->b_ml.ml_line_ptr;
 
     hp = ml_find_line(buf, lnum, ML_FIND);
-    if (hp == NULL)
-      EMSGN(_("E320: Cannot find line %" PRId64), lnum);
-    else {
+    if (hp == NULL) {
+      IEMSGN(_("E320: Cannot find line %" PRId64), lnum);
+    } else {
       dp = hp->bh_data;
       idx = lnum - buf->b_ml.ml_locked_low;
       start = ((dp->db_index[idx]) & DB_INDEX_MASK);
@@ -2841,7 +2842,7 @@ static bhdr_T *ml_find_line(buf_T *buf, linenr_T lnum, int action)
 
     pp = (PTR_BL *)(dp);                /* must be pointer block */
     if (pp->pb_id != PTR_ID) {
-      EMSG(_("E317: pointer block id wrong"));
+      IEMSG(_("E317: pointer block id wrong"));
       goto error_block;
     }
 
@@ -2878,13 +2879,14 @@ static bhdr_T *ml_find_line(buf_T *buf, linenr_T lnum, int action)
         break;
       }
     }
-    if (idx >= (int)pp->pb_count) {         /* past the end: something wrong! */
-      if (lnum > buf->b_ml.ml_line_count)
-        EMSGN(_("E322: line number out of range: %" PRId64 " past the end"),
-            lnum - buf->b_ml.ml_line_count);
+    if (idx >= (int)pp->pb_count) {         // past the end: something wrong!
+      if (lnum > buf->b_ml.ml_line_count) {
+        IEMSGN(_("E322: line number out of range: %" PRId64 " past the end"),
+               lnum - buf->b_ml.ml_line_count);
 
-      else
-        EMSGN(_("E323: line count wrong in block %" PRId64), bnum);
+      } else {
+        IEMSGN(_("E323: line count wrong in block %" PRId64), bnum);
+      }
       goto error_block;
     }
     if (action == ML_DELETE) {
@@ -2960,7 +2962,7 @@ static void ml_lineadd(buf_T *buf, int count)
     pp = hp->bh_data;       /* must be pointer block */
     if (pp->pb_id != PTR_ID) {
       mf_put(mfp, hp, false, false);
-      EMSG(_("E317: pointer block id wrong 2"));
+      IEMSG(_("E317: pointer block id wrong 2"));
       break;
     }
     pp->pb_pointer[ip->ip_index].pe_line_count += count;
diff --git a/src/nvim/message.c b/src/nvim/message.c
index 5c8f0655bf..1d9a4de9c0 100644
--- a/src/nvim/message.c
+++ b/src/nvim/message.c
@@ -583,19 +583,60 @@ void emsg_invreg(int name)
 /// Print an error message with unknown number of arguments
 bool emsgf(const char *const fmt, ...)
 {
+  bool ret;
+
+  va_list ap;
+  va_start(ap, fmt);
+  ret = emsgfv(fmt, ap);
+  va_end(ap);
+
+  return ret;
+}
+
+/// Print an error message with unknown number of arguments
+static bool emsgfv(const char *fmt, va_list ap)
+{
   static char errbuf[IOSIZE];
   if (emsg_not_now()) {
     return true;
   }
 
-  va_list ap;
-  va_start(ap, fmt);
   vim_vsnprintf(errbuf, sizeof(errbuf), fmt, ap, NULL);
-  va_end(ap);
 
   return emsg((const char_u *)errbuf);
 }
 
+/// Same as emsg(...), but abort on error when ABORT_ON_INTERNAL_ERROR is
+/// defined. It is used for internal errors only, so that they can be
+/// detected when fuzzing vim.
+void iemsg(const char *s)
+{
+    msg((char_u *)s);
+#ifdef ABORT_ON_INTERNAL_ERROR
+    abort();
+#endif
+}
+
+/// Same as emsgf(...) but abort on error when ABORT_ON_INTERNAL_ERROR is
+/// defined. It is used for internal errors only, so that they can be
+/// detected when fuzzing vim.
+void iemsgf(const char *s, ...)
+{
+    va_list ap;
+    va_start(ap, s);
+    (void)emsgfv(s, ap);
+    va_end(ap);
+#ifdef ABORT_ON_INTERNAL_ERROR
+    abort();
+#endif
+}
+
+/// Give an "Internal error" message.
+void internal_error(char *where)
+{
+    IEMSG2(_(e_intern2), where);
+}
+
 static void msg_emsgf_event(void **argv)
 {
   char *s = argv[0];
diff --git a/src/nvim/message.h b/src/nvim/message.h
index 904a9d3ca1..82935a36a9 100644
--- a/src/nvim/message.h
+++ b/src/nvim/message.h
@@ -49,6 +49,15 @@
 /// Like #EMSG, but for messages with one "%" PRIu64 inside
 #define EMSGU(s, n)                 emsgf((const char *) (s), (uint64_t)(n))
 
+/// Like #EMSG, but for internal messages
+#define IEMSG(s)                    iemsg((const char *)(s))
+
+/// Like #EMSG2, but for internal messages
+#define IEMSG2(s, p)                iemsgf((const char *)(s), (p))
+
+/// Like #EMSGN, but for internal messages
+#define IEMSGN(s, n)                iemsgf((const char *)(s), (int64_t)(n))
+
 /// Display message at the recorded position
 #define MSG_PUTS(s)                 msg_puts((const char *)(s))
 
diff --git a/src/nvim/option.c b/src/nvim/option.c
index f8a05f133d..a345906200 100644
--- a/src/nvim/option.c
+++ b/src/nvim/option.c
@@ -74,6 +74,7 @@
 #include "nvim/undo.h"
 #include "nvim/window.h"
 #include "nvim/os/os.h"
+#include "nvim/api/private/helpers.h"
 #include "nvim/os/input.h"
 #include "nvim/os/lang.h"
 
@@ -248,6 +249,7 @@ typedef struct vimoption {
 
 #define P_RWINONLY     0x10000000U  ///< only redraw current window
 #define P_NDNAME       0x20000000U  ///< only normal dir name chars allowed
+#define P_UI_OPTION    0x40000000U  ///< send option to remote ui
 
 #define HIGHLIGHT_INIT \
   "8:SpecialKey,~:EndOfBuffer,z:TermCursor,Z:TermCursorNC,@:NonText," \
@@ -1188,6 +1190,7 @@ do_set (
         set_options_default(OPT_FREE | opt_flags);
         didset_options();
         didset_options2();
+        ui_refresh_options();
         redraw_all_later(CLEAR);
       } else {
         showoptions(1, opt_flags);
@@ -1815,6 +1818,10 @@ do_set (
                              NULL, false, NULL);
               reset_v_option_vars();
               xfree(saved_origval);
+              if (options[opt_idx].flags & P_UI_OPTION) {
+                ui_call_option_set(cstr_as_string(options[opt_idx].fullname),
+                                   STRING_OBJ(cstr_as_string(*(char **)varp)));
+              }
             }
           } else {
             // key code option(FIXME(tarruda): Show a warning or something
@@ -2251,7 +2258,7 @@ int was_set_insecurely(char_u *opt, int opt_flags)
     uint32_t *flagp = insecure_flag(idx, opt_flags);
     return (*flagp & P_INSECURE) != 0;
   }
-  EMSG2(_(e_intern2), "was_set_insecurely()");
+  internal_error("was_set_insecurely()");
   return -1;
 }
 
@@ -2310,8 +2317,8 @@ set_string_option_direct (
   if (idx == -1) {  // Use name.
     idx = findoption((const char *)name);
     if (idx < 0) {  // Not found (should not happen).
-      EMSG2(_(e_intern2), "set_string_option_direct()");
-      EMSG2(_("For option %s"), name);
+      internal_error("set_string_option_direct()");
+      IEMSG2(_("For option %s"), name);
       return;
     }
   }
@@ -2417,6 +2424,10 @@ static char *set_string_option(const int opt_idx, const char *const value,
                    NULL, false, NULL);
     reset_v_option_vars();
     xfree(saved_oldval);
+    if (options[opt_idx].flags & P_UI_OPTION) {
+      ui_call_option_set(cstr_as_string(options[opt_idx].fullname),
+                         STRING_OBJ(cstr_as_string((char *)(*varp))));
+    }
   }
 
   return r;
@@ -4024,6 +4035,10 @@ static char *set_bool_option(const int opt_idx, char_u *const varp,
                    (char_u *) options[opt_idx].fullname,
                    NULL, false, NULL);
     reset_v_option_vars();
+    if (options[opt_idx].flags & P_UI_OPTION) {
+      ui_call_option_set(cstr_as_string(options[opt_idx].fullname),
+                         BOOLEAN_OBJ(value));
+    }
   }
 
   comp_col();                       /* in case 'ruler' or 'showcmd' changed */
@@ -4429,6 +4444,10 @@ static char *set_num_option(int opt_idx, char_u *varp, long value,
                    (char_u *) options[opt_idx].fullname,
                    NULL, false, NULL);
     reset_v_option_vars();
+    if (options[opt_idx].flags & P_UI_OPTION) {
+      ui_call_option_set(cstr_as_string(options[opt_idx].fullname),
+                         INTEGER_OBJ(value));
+    }
   }
 
   comp_col();                       /* in case 'columns' or 'ls' changed */
@@ -4999,6 +5018,29 @@ static int optval_default(vimoption_T *p, char_u *varp)
   return STRCMP(*(char_u **)varp, p->def_val[dvi]) == 0;
 }
 
+/// Send update to UIs with values of UI relevant options
+void ui_refresh_options(void)
+{
+  for (int opt_idx = 0; options[opt_idx].fullname; opt_idx++) {
+    uint32_t flags = options[opt_idx].flags;
+    if (!(flags & P_UI_OPTION)) {
+      continue;
+    }
+    String name = cstr_as_string(options[opt_idx].fullname);
+    void *varp = options[opt_idx].var;
+    Object value = OBJECT_INIT;
+    if (flags & P_BOOL) {
+      value = BOOLEAN_OBJ(*(int *)varp);
+    } else if (flags & P_NUM) {
+      value = INTEGER_OBJ(*(long *)varp);
+    } else if (flags & P_STRING) {
+      // cstr_as_string handles NULL string
+      value = STRING_OBJ(cstr_as_string(*(char **)varp));
+    }
+    ui_call_option_set(name, value);
+  }
+}
+
 /*
  * showoneopt: show the value of one option
  * must not be called with a hidden option!
@@ -5542,7 +5584,7 @@ static char_u *get_varp(vimoption_T *p)
   case PV_KMAP:   return (char_u *)&(curbuf->b_p_keymap);
   case PV_SCL:    return (char_u *)&(curwin->w_p_scl);
   case PV_WINHL:  return (char_u *)&(curwin->w_p_winhl);
-  default:        EMSG(_("E356: get_varp ERROR"));
+  default:        IEMSG(_("E356: get_varp ERROR"));
   }
   /* always return a valid pointer to avoid a crash! */
   return (char_u *)&(curbuf->b_p_wm);
diff --git a/src/nvim/option_defs.h b/src/nvim/option_defs.h
index b16f222705..1b978137ae 100644
--- a/src/nvim/option_defs.h
+++ b/src/nvim/option_defs.h
@@ -447,6 +447,9 @@ EXTERN char_u   *p_popt;        // 'printoptions'
 EXTERN char_u   *p_header;      // 'printheader'
 EXTERN int p_prompt;            // 'prompt'
 EXTERN char_u   *p_guicursor;   // 'guicursor'
+EXTERN char_u   *p_guifont;     // 'guifont'
+EXTERN char_u   *p_guifontset;  // 'guifontset'
+EXTERN char_u   *p_guifontwide;  // 'guifontwide'
 EXTERN char_u   *p_hf;          // 'helpfile'
 EXTERN long p_hh;               // 'helpheight'
 EXTERN char_u   *p_hlg;         // 'helplang'
diff --git a/src/nvim/options.lua b/src/nvim/options.lua
index dd28a765fd..45efd49391 100644
--- a/src/nvim/options.lua
+++ b/src/nvim/options.lua
@@ -68,7 +68,8 @@ return {
       type='bool', scope={'global'},
       vi_def=true,
       vim=true,
-      redraw={'everything'},
+      redraw={'everything', 'ui_option'},
+
       varname='p_arshape',
       defaults={if_true={vi=true}}
     },
@@ -91,7 +92,7 @@ return {
       full_name='ambiwidth', abbreviation='ambw',
       type='string', scope={'global'},
       vi_def=true,
-      redraw={'everything'},
+      redraw={'everything', 'ui_option'},
       varname='p_ambw',
       defaults={if_true={vi="single"}}
     },
@@ -661,7 +662,7 @@ return {
       full_name='emoji', abbreviation='emo',
       type='bool', scope={'global'},
       vi_def=true,
-      redraw={'everything'},
+      redraw={'everything', 'ui_option'},
       varname='p_emoji',
       defaults={if_true={vi=true}}
     },
@@ -1021,23 +1022,26 @@ return {
       type='string', list='onecomma', scope={'global'},
       deny_duplicates=true,
       vi_def=true,
-      redraw={'everything'},
-      enable_if=false,
+      varname='p_guifont',
+      redraw={'everything', 'ui_option'},
+      defaults={if_true={vi=""}}
     },
     {
       full_name='guifontset', abbreviation='gfs',
       type='string', list='onecomma', scope={'global'},
       vi_def=true,
-      redraw={'everything'},
-      enable_if=false,
+      varname='p_guifontset',
+      redraw={'everything', 'ui_option'},
+      defaults={if_true={vi=""}}
     },
     {
       full_name='guifontwide', abbreviation='gfw',
       type='string', list='onecomma', scope={'global'},
       deny_duplicates=true,
       vi_def=true,
-      redraw={'everything'},
-      enable_if=false,
+      redraw={'everything', 'ui_option'},
+      varname='p_guifontwide',
+      defaults={if_true={vi=""}}
     },
     {
       full_name='guioptions', abbreviation='go',
@@ -2164,7 +2168,7 @@ return {
       full_name='showtabline', abbreviation='stal',
       type='number', scope={'global'},
       vi_def=true,
-      redraw={'all_windows'},
+      redraw={'all_windows', 'ui_option'},
       varname='p_stal',
       defaults={if_true={vi=1}}
     },
@@ -2435,7 +2439,7 @@ return {
       full_name='termguicolors', abbreviation='tgc',
       type='bool', scope={'global'},
       vi_def=false,
-      redraw={'everything'},
+      redraw={'everything', 'ui_option'},
       varname='p_tgc',
       defaults={if_true={vi=false}}
     },
@@ -2505,11 +2509,10 @@ return {
       full_name='titleold',
       type='string', scope={'global'},
       secure=true,
-      gettext=true,
       no_mkrc=true,
       vi_def=true,
       varname='p_titleold',
-      defaults={if_true={vi=N_("")}}
+      defaults={if_true={vi=""}}
     },
     {
       full_name='titlestring',
diff --git a/src/nvim/os/env.c b/src/nvim/os/env.c
index de0cd10d9c..999fcd434a 100644
--- a/src/nvim/os/env.c
+++ b/src/nvim/os/env.c
@@ -887,7 +887,7 @@ bool os_setenv_append_path(const char *fname)
 # define MAX_ENVPATHLEN INT_MAX
 #endif
   if (!path_is_absolute_path((char_u *)fname)) {
-    EMSG2(_(e_intern2), "os_setenv_append_path()");
+    internal_error("os_setenv_append_path()");
     return false;
   }
   const char *tail = (char *)path_tail_with_sep((char_u *)fname);
diff --git a/src/nvim/os/pty_process_unix.c b/src/nvim/os/pty_process_unix.c
index 53301e4b53..855ca2ae47 100644
--- a/src/nvim/os/pty_process_unix.c
+++ b/src/nvim/os/pty_process_unix.c
@@ -72,8 +72,7 @@ int pty_process_spawn(PtyProcess *ptyproc)
     ELOG("forkpty failed: %s", strerror(errno));
     return status;
   } else if (pid == 0) {
-    init_child(ptyproc);
-    abort();
+    init_child(ptyproc);  // never returns
   }
 
   // make sure the master file descriptor is non blocking
@@ -163,14 +162,15 @@ static void init_child(PtyProcess *ptyproc) FUNC_ATTR_NONNULL_ALL
 
   Process *proc = (Process *)ptyproc;
   if (proc->cwd && os_chdir(proc->cwd) != 0) {
-    fprintf(stderr, "chdir failed: %s\n", strerror(errno));
+    ELOG("chdir failed: %s", strerror(errno));
     return;
   }
 
   char *prog = ptyproc->process.argv[0];
   setenv("TERM", ptyproc->term_name ? ptyproc->term_name : "ansi", 1);
   execvp(prog, ptyproc->process.argv);
-  fprintf(stderr, "execvp failed: %s: %s\n", strerror(errno), prog);
+  ELOG("execvp failed: %s: %s", strerror(errno), prog);
+  _exit(122);  // 122 is EXEC_FAILED in the Vim source.
 }
 
 static void init_termios(struct termios *termios) FUNC_ATTR_NONNULL_ALL
diff --git a/src/nvim/os/signal.c b/src/nvim/os/signal.c
index fd6d3b32e4..732be072e1 100644
--- a/src/nvim/os/signal.c
+++ b/src/nvim/os/signal.c
@@ -10,6 +10,7 @@
 #endif
 
 #include "nvim/ascii.h"
+#include "nvim/log.h"
 #include "nvim/vim.h"
 #include "nvim/globals.h"
 #include "nvim/memline.h"
@@ -162,7 +163,7 @@ static void on_signal(SignalWatcher *handle, int signum, void *data)
       }
       break;
     default:
-      fprintf(stderr, "Invalid signal %d", signum);
+      ELOG("invalid signal: %d", signum);
       break;
   }
 }
diff --git a/src/nvim/quickfix.c b/src/nvim/quickfix.c
index a4dc9c68ce..7e2193b8bb 100644
--- a/src/nvim/quickfix.c
+++ b/src/nvim/quickfix.c
@@ -2856,7 +2856,7 @@ static void qf_fill_buffer(qf_info_T *qi, buf_T *buf, qfline_T *old_last)
 
   if (old_last == NULL) {
     if (buf != curbuf) {
-      EMSG2(_(e_intern2), "qf_fill_buffer()");
+      internal_error("qf_fill_buffer()");
       return;
     }
 
diff --git a/src/nvim/regexp.c b/src/nvim/regexp.c
index 463a408885..a1332a43dd 100644
--- a/src/nvim/regexp.c
+++ b/src/nvim/regexp.c
@@ -458,16 +458,13 @@ static int toggle_Magic(int x)
 
 /* Used for an error (down from) vim_regcomp(): give the error message, set
  * rc_did_emsg and return NULL */
-#define EMSG_RET_NULL(m) return (EMSG(m), rc_did_emsg = TRUE, (void *)NULL)
-#define EMSG_RET_FAIL(m) return (EMSG(m), rc_did_emsg = TRUE, FAIL)
-#define EMSG2_RET_NULL(m, \
-                       c) return (EMSG2((m), \
-                                      (c) ? "" : "\\"), rc_did_emsg = TRUE, \
-                                  (void *)NULL)
-#define EMSG2_RET_FAIL(m, \
-                       c) return (EMSG2((m), \
-                                      (c) ? "" : "\\"), rc_did_emsg = TRUE, \
-                                  FAIL)
+#define EMSG_RET_NULL(m) return (EMSG(m), rc_did_emsg = true, (void *)NULL)
+#define IEMSG_RET_NULL(m) return (IEMSG(m), rc_did_emsg = true, (void *)NULL)
+#define EMSG_RET_FAIL(m) return (EMSG(m), rc_did_emsg = true, FAIL)
+#define EMSG2_RET_NULL(m, c) \
+        return (EMSG2((m), (c) ? "" : "\\"), rc_did_emsg = true, (void *)NULL)
+#define EMSG2_RET_FAIL(m, c) \
+        return (EMSG2((m), (c) ? "" : "\\"), rc_did_emsg = true, FAIL)
 #define EMSG_ONE_RET_NULL EMSG2_RET_NULL(_( \
         "E369: invalid item in %s%%[]"), reg_magic == MAGIC_ALL)
 
@@ -1891,8 +1888,8 @@ static char_u *regatom(int *flagp)
   case Magic(')'):
     if (one_exactly)
       EMSG_ONE_RET_NULL;
-    EMSG_RET_NULL(_(e_internal));       /* Supposed to be caught earlier. */
-  /* NOTREACHED */
+    IEMSG_RET_NULL(_(e_internal));       // Supposed to be caught earlier.
+  // NOTREACHED
 
   case Magic('='):
   case Magic('?'):
@@ -4534,7 +4531,7 @@ regmatch (
             brace_max[no] = OPERAND_MAX(scan);
             brace_count[no] = 0;
           } else {
-            EMSG(_(e_internal));                    /* Shouldn't happen */
+            internal_error("BRACE_LIMITS");
             status = RA_FAIL;
           }
         }
diff --git a/src/nvim/spell.c b/src/nvim/spell.c
index 6a1b46fb5b..d2b2575f6a 100644
--- a/src/nvim/spell.c
+++ b/src/nvim/spell.c
@@ -5354,7 +5354,7 @@ add_sound_suggest (
   // Find the word nr in the soundfold tree.
   sfwordnr = soundfold_find(slang, goodword);
   if (sfwordnr < 0) {
-    EMSG2(_(e_intern2), "add_sound_suggest()");
+    internal_error("add_sound_suggest()");
     return;
   }
 
diff --git a/src/nvim/tui/tui.c b/src/nvim/tui/tui.c
index 60897c08da..021bb6eac4 100644
--- a/src/nvim/tui/tui.c
+++ b/src/nvim/tui/tui.c
@@ -70,6 +70,7 @@ typedef struct {
   UIBridgeData *bridge;
   Loop *loop;
   bool stop;
+  uv_timer_t after_startup_timer;
   unibi_var_t params[9];
   char buf[OUTBUF_SIZE];
   size_t bufpos;
@@ -151,6 +152,7 @@ UI *tui_start(void)
   ui->suspend = tui_suspend;
   ui->set_title = tui_set_title;
   ui->set_icon = tui_set_icon;
+  ui->option_set= tui_option_set;
   ui->event = tui_event;
 
   memset(ui->ui_ext, 0, sizeof(ui->ui_ext));
@@ -168,24 +170,6 @@ static size_t unibi_pre_fmt_str(TUIData *data, unsigned int unibi_index,
   return unibi_run(str, data->params, buf, len);
 }
 
-/// Emits some termcodes after Nvim startup, which were observed to slowdown
-/// rendering during startup in tmux 2.3 (+focus-events). #7649
-static void terminfo_after_startup_event(void **argv)
-{
-  UI *ui = argv[0];
-  bool defer = argv[1] != NULL;  // clever(?) boolean without malloc() dance.
-  TUIData *data = ui->data;
-  if (defer) {  // We're on the main-loop. Now forward to the TUI loop.
-    loop_schedule(data->loop,
-                  event_create(terminfo_after_startup_event, 2, ui, NULL));
-    return;
-  }
-  // Enable bracketed paste
-  unibi_out_ext(ui, data->unibi_ext.enable_bracketed_paste);
-  // Enable focus reporting
-  unibi_out_ext(ui, data->unibi_ext.enable_focus_reporting);
-}
-
 static void termname_set_event(void **argv)
 {
   char *termname = argv[0];
@@ -265,6 +249,9 @@ static void terminfo_start(UI *ui)
   unibi_out(ui, unibi_enter_ca_mode);
   unibi_out(ui, unibi_keypad_xmit);
   unibi_out(ui, unibi_clear_screen);
+  // Enable bracketed paste
+  unibi_out_ext(ui, data->unibi_ext.enable_bracketed_paste);
+
   uv_loop_init(&data->write_loop);
   if (data->out_isatty) {
     uv_tty_init(&data->write_loop, &data->output_handle.tty, data->out_fd, 0);
@@ -277,9 +264,6 @@ static void terminfo_start(UI *ui)
     uv_pipe_init(&data->write_loop, &data->output_handle.pipe, 0);
     uv_pipe_open(&data->output_handle.pipe, data->out_fd);
   }
-
-  loop_schedule(&main_loop,
-                event_create(terminfo_after_startup_event, 2, ui, ui));
 }
 
 static void terminfo_stop(UI *ui)
@@ -307,6 +291,18 @@ static void terminfo_stop(UI *ui)
   unibi_destroy(data->ut);
 }
 
+static void after_startup_timer_cb(uv_timer_t *handle)
+  FUNC_ATTR_NONNULL_ALL
+{
+  UI *ui = handle->data;
+  TUIData *data = ui->data;
+  uv_timer_stop(&data->after_startup_timer);
+
+  // Emit this after Nvim startup, not during.  This works around a tmux
+  // 2.3 bug(?) which caused slow drawing during startup.  #7649
+  unibi_out_ext(ui, data->unibi_ext.enable_focus_reporting);
+}
+
 static void tui_terminal_start(UI *ui)
 {
   TUIData *data = ui->data;
@@ -316,6 +312,8 @@ static void tui_terminal_start(UI *ui)
   update_size(ui);
   signal_watcher_start(&data->winch_handle, sigwinch_cb, SIGWINCH);
   term_input_start(&data->input);
+
+  uv_timer_start(&data->after_startup_timer, after_startup_timer_cb, 500, 0);
 }
 
 static void tui_terminal_stop(UI *ui)
@@ -349,6 +347,8 @@ static void tui_main(UIBridgeData *bridge, UI *ui)
 #ifdef UNIX
   signal_watcher_start(&data->cont_handle, sigcont_cb, SIGCONT);
 #endif
+  uv_timer_init(&data->loop->uv, &data->after_startup_timer);
+  data->after_startup_timer.data = ui;
 
 #if TERMKEY_VERSION_MAJOR > 0 || TERMKEY_VERSION_MINOR > 18
   data->input.tk_ti_hook_fn = tui_tk_ti_getstr;
@@ -367,6 +367,7 @@ static void tui_main(UIBridgeData *bridge, UI *ui)
     loop_poll_events(&tui_loop, -1);  // tui_loop.events is never processed
   }
 
+  uv_close((uv_handle_t *)&data->after_startup_timer, NULL);
   ui_bridge_stopped(bridge);
   term_input_destroy(&data->input);
   signal_watcher_stop(&data->cont_handle);
@@ -1136,6 +1137,14 @@ static void tui_set_icon(UI *ui, String icon)
 {
 }
 
+static void tui_option_set(UI *ui, String name, Object value)
+{
+  if (strequal(name.data, "termguicolors")) {
+    // NB: value for bridge is set in ui_bridge.c
+    ui->rgb = value.data.boolean;
+  }
+}
+
 // NB: if we start to use this, the ui_bridge must be updated
 // to make a copy for the tui thread
 static void tui_event(UI *ui, char *name, Array args, bool *args_consumed)
diff --git a/src/nvim/ui.c b/src/nvim/ui.c
index 3b8b3ac9a7..81da88c54a 100644
--- a/src/nvim/ui.c
+++ b/src/nvim/ui.c
@@ -339,6 +339,7 @@ void ui_attach_impl(UI *ui)
   }
 
   uis[ui_count++] = ui;
+  ui_refresh_options();
   ui_refresh();
 }
 
diff --git a/src/nvim/ui.h b/src/nvim/ui.h
index f1ea0716e6..0e40a1a215 100644
--- a/src/nvim/ui.h
+++ b/src/nvim/ui.h
@@ -31,11 +31,9 @@ struct ui_t {
   bool ui_ext[UI_WIDGETS];  ///< Externalized widgets
   int width, height;
   void *data;
-
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "ui_events.generated.h"
 #endif
-
   void (*event)(UI *ui, char *name, Array args, bool *args_consumed);
   void (*stop)(UI *ui);
 };
diff --git a/src/nvim/ui_bridge.c b/src/nvim/ui_bridge.c
index 7573fa1653..0a69cf0ecb 100644
--- a/src/nvim/ui_bridge.c
+++ b/src/nvim/ui_bridge.c
@@ -66,6 +66,7 @@ UI *ui_bridge_attach(UI *ui, ui_main_fn ui_main, event_scheduler scheduler)
   rv->bridge.suspend = ui_bridge_suspend;
   rv->bridge.set_title = ui_bridge_set_title;
   rv->bridge.set_icon = ui_bridge_set_icon;
+  rv->bridge.option_set = ui_bridge_option_set;
   rv->scheduler = scheduler;
 
   for (UIWidget i = 0; (int)i < UI_WIDGETS; i++) {
@@ -144,6 +145,29 @@ static void ui_bridge_highlight_set_event(void **argv)
   xfree(argv[1]);
 }
 
+static void ui_bridge_option_set(UI *ui, String name, Object value)
+{
+  // Assumes bridge is only used by TUI
+  if (strequal(name.data, "termguicolors")) {
+    ui->rgb = value.data.boolean;
+  }
+  String copy_name = copy_string(name);
+  Object *copy_value = xmalloc(sizeof(Object));
+  *copy_value = copy_object(value);
+  UI_BRIDGE_CALL(ui, option_set, 4, ui,
+                 copy_name.data, INT2PTR(copy_name.size), copy_value);
+}
+static void ui_bridge_option_set_event(void **argv)
+{
+  UI *ui = UI(argv[0]);
+  String name = (String){ .data = argv[1], .size = (size_t)argv[2] };
+  Object value = *(Object *)argv[3];
+  ui->option_set(ui, name, value);
+  api_free_string(name);
+  api_free_object(value);
+  xfree(argv[3]);
+}
+
 static void ui_bridge_suspend(UI *b)
 {
   UIBridgeData *data = (UIBridgeData *)b;
diff --git a/src/nvim/undo.c b/src/nvim/undo.c
index 3d7ebc8837..f611a3bb29 100644
--- a/src/nvim/undo.c
+++ b/src/nvim/undo.c
@@ -2096,8 +2096,8 @@ void undo_time(long step, int sec, int file, int absolute)
 
       uhp = uhp->uh_prev.ptr;
       if (uhp == NULL || uhp->uh_walk != mark) {
-        /* Need to redo more but can't find it... */
-        EMSG2(_(e_intern2), "undo_time()");
+        // Need to redo more but can't find it...
+        internal_error("undo_time()");
         break;
       }
     }
@@ -2163,8 +2163,8 @@ static void u_undoredo(int undo)
     if (top > curbuf->b_ml.ml_line_count || top >= bot
         || bot > curbuf->b_ml.ml_line_count + 1) {
       unblock_autocmds();
-      EMSG(_("E438: u_undo: line numbers wrong"));
-      changed();                /* don't want UNCHANGED now */
+      IEMSG(_("E438: u_undo: line numbers wrong"));
+      changed();                // don't want UNCHANGED now
       return;
     }
 
@@ -2655,7 +2655,7 @@ static void u_unch_branch(u_header_T *uhp)
 static u_entry_T *u_get_headentry(void)
 {
   if (curbuf->b_u_newhead == NULL || curbuf->b_u_newhead->uh_entry == NULL) {
-    EMSG(_("E439: undo list corrupt"));
+    IEMSG(_("E439: undo list corrupt"));
     return NULL;
   }
   return curbuf->b_u_newhead->uh_entry;
@@ -2684,11 +2684,11 @@ static void u_getbot(void)
     extra = curbuf->b_ml.ml_line_count - uep->ue_lcount;
     uep->ue_bot = uep->ue_top + uep->ue_size + 1 + extra;
     if (uep->ue_bot < 1 || uep->ue_bot > curbuf->b_ml.ml_line_count) {
-      EMSG(_("E440: undo line missing"));
-      uep->ue_bot = uep->ue_top + 1;        /* assume all lines deleted, will
-                                             * get all the old lines back
-                                             * without deleting the current
-                                             * ones */
+      IEMSG(_("E440: undo line missing"));
+      uep->ue_bot = uep->ue_top + 1;        // assume all lines deleted, will
+                                            // get all the old lines back
+                                            // without deleting the current
+                                            // ones
     }
 
     curbuf->b_u_newhead->uh_getbot_entry = NULL;
diff --git a/src/nvim/version.c b/src/nvim/version.c
index e8cf1d0f0b..8ab9fc1a4b 100644
--- a/src/nvim/version.c
+++ b/src/nvim/version.c
@@ -1182,7 +1182,7 @@ static const int included_patches[] = {
   // 77 NA
   // 76 NA
   75,
-  // 74,
+  74,
   73,
   // 72 NA
   // 71 NA
diff --git a/src/nvim/window.c b/src/nvim/window.c
index 583314d437..5e85a9bede 100644
--- a/src/nvim/window.c
+++ b/src/nvim/window.c
@@ -2115,7 +2115,7 @@ void win_close_othertab(win_T *win, int free_buf, tabpage_T *tp)
            ptp = ptp->tp_next)
         ;
       if (ptp == NULL) {
-        EMSG2(_(e_intern2), "win_close_othertab()");
+        internal_error("win_close_othertab()");
         return;
       }
       ptp->tp_next = tp->tp_next;