vim-patch:7.4.709

Problem:    ":tabmove" does not work as documented.
Solution:   Make it work consistently.  Update documentation and add tests.
            (Hirohito Higashi)

https://github.com/vim/vim/commit/40ce3a4e1f50badb75ca812e26557a9bc5fde8c6

3 files changed, 48 insertions, 22 deletions

diff --git a/src/nvim/ex_docmd.c b/src/nvim/ex_docmd.c
index cbe7c1a231..1ae440c757 100644
--- a/src/nvim/ex_docmd.c
+++ b/src/nvim/ex_docmd.c
@@ -6345,7 +6345,7 @@ static void ex_tabnext(exarg_T *eap)
  */
 static void ex_tabmove(exarg_T *eap)
 {
-  int tab_number = 9999;
+  int tab_number;
 
   if (eap->arg && *eap->arg != NUL) {
     char_u *p = eap->arg;
@@ -6361,17 +6361,35 @@ static void ex_tabmove(exarg_T *eap)
     } else
       p = eap->arg;
 
-    if (p == skipdigits(p)) {
-      /* No numbers as argument. */
-      eap->errmsg = e_invarg;
-      return;
+    if (relative == 0) {
+      if (STRCMP(p, "$") == 0) {
+        tab_number = LAST_TAB_NR;
+      } else if (p == skipdigits(p)) {
+        // No numbers as argument.
+        eap->errmsg = e_invarg;
+        return;
+      } else {
+        tab_number = getdigits(&p);
+      }
+    } else {
+      if (*p != NUL) {
+        tab_number = getdigits(&p);
+      } else {
+        tab_number = 1;
+      }
+      tab_number = tab_number * relative + tabpage_index(curtab);
+      if (relative == -1) {
+        --tab_number;
+      }
     }
-
-    tab_number = getdigits_int(&p);
-    if (relative != 0)
-      tab_number = tab_number * relative + tabpage_index(curtab) - 1; ;
-  } else if (eap->addr_count != 0)
+  } else if (eap->addr_count != 0) {
     tab_number = eap->line2;
+    if (**eap->cmdlinep == '-') {
+      --tab_number;
+    }
+  } else {
+    tab_number = LAST_TAB_NR;
+  }
 
   tabpage_move(tab_number);
 }
diff --git a/src/nvim/version.c b/src/nvim/version.c
index bf1986d3ba..9fb315acb7 100644
--- a/src/nvim/version.c
+++ b/src/nvim/version.c
@@ -415,7 +415,7 @@ static int included_patches[] = {
   712,
   711,
   710,
-  // 709,
+  709,
   // 708,
   707,
   706,
diff --git a/src/nvim/window.c b/src/nvim/window.c
index 853f8755c3..64034863ed 100644
--- a/src/nvim/window.c
+++ b/src/nvim/window.c
@@ -3274,17 +3274,27 @@ void goto_tabpage_win(tabpage_T *tp, win_T *wp)
   }
 }
 
-/*
- * Move the current tab page to before tab page "nr".
- */
+// Move the current tab page to after tab page "nr".
 void tabpage_move(int nr)
 {
-  int n = nr;
-  tabpage_T   *tp;
+  int n = 1;
+  tabpage_T *tp;
+  tabpage_T *tp_dst;
 
   if (first_tabpage->tp_next == NULL)
     return;
 
+  for (tp = first_tabpage; tp->tp_next != NULL && n < nr; tp = tp->tp_next) {
+    ++n;
+  }
+
+  if (tp == curtab || (nr > 0 && tp->tp_next != NULL
+                       && tp->tp_next == curtab)) {
+    return;
+  }
+
+  tp_dst = tp;
+
   /* Remove the current tab page from the list of tab pages. */
   if (curtab == first_tabpage)
     first_tabpage = curtab->tp_next;
@@ -3297,15 +3307,13 @@ void tabpage_move(int nr)
     tp->tp_next = curtab->tp_next;
   }
 
-  /* Re-insert it at the specified position. */
-  if (n <= 0) {
+  // Re-insert it at the specified position.
+  if (nr <= 0) {
     curtab->tp_next = first_tabpage;
     first_tabpage = curtab;
   } else {
-    for (tp = first_tabpage; tp->tp_next != NULL && n > 1; tp = tp->tp_next)
-      --n;
-    curtab->tp_next = tp->tp_next;
-    tp->tp_next = curtab;
+    curtab->tp_next = tp_dst->tp_next;
+    tp_dst->tp_next = curtab;
   }
 
   /* Need to redraw the tabline.  Tab page contents doesn't change. */