quickfix: fix location list updates.

Fix quickfix performance optimization which prevented quickfix items
from being updated when there were multiple windows with location lists
but the buffer with errors only in one of the lists.

2 files changed, 17 insertions, 11 deletions

diff --git a/src/nvim/mark.c b/src/nvim/mark.c
index 7889fabd45..1ba400972c 100644
--- a/src/nvim/mark.c
+++ b/src/nvim/mark.c
@@ -951,11 +951,17 @@ static void mark_adjust_internal(linenr_T line1, linenr_T line2,
     one_adjust_nodel(&(curbuf->b_visual.vi_start.lnum));
     one_adjust_nodel(&(curbuf->b_visual.vi_end.lnum));
 
-    /* quickfix marks */
-    qf_mark_adjust(NULL, line1, line2, amount, amount_after);
-    /* location lists */
+    // quickfix marks
+    if (!qf_mark_adjust(NULL, line1, line2, amount, amount_after)) {
+      curbuf->b_has_qf_entry &= ~BUF_HAS_QF_ENTRY;
+    }
+    // location lists
+    bool found_one = false;
     FOR_ALL_TAB_WINDOWS(tab, win) {
-      qf_mark_adjust(win, line1, line2, amount, amount_after);
+      found_one |= qf_mark_adjust(win, line1, line2, amount, amount_after);
+    }
+    if (!found_one) {
+      curbuf->b_has_qf_entry &= ~BUF_HAS_LL_ENTRY;
     }
 
     sign_mark_adjust(line1, line2, amount, amount_after);
diff --git a/src/nvim/quickfix.c b/src/nvim/quickfix.c
index e6b1e7b95a..b9228e15b9 100644
--- a/src/nvim/quickfix.c
+++ b/src/nvim/quickfix.c
@@ -2379,7 +2379,8 @@ static void qf_free(qf_info_T *qi, int idx)
 /*
  * qf_mark_adjust: adjust marks
  */
-void qf_mark_adjust(win_T *wp, linenr_T line1, linenr_T line2, long amount, long amount_after)
+bool qf_mark_adjust(win_T *wp, linenr_T line1, linenr_T line2, long amount,
+                    long amount_after)
 {
   int i;
   qfline_T    *qfp;
@@ -2389,11 +2390,12 @@ void qf_mark_adjust(win_T *wp, linenr_T line1, linenr_T line2, long amount, long
   int buf_has_flag = wp == NULL ? BUF_HAS_QF_ENTRY : BUF_HAS_LL_ENTRY;
 
   if (!(curbuf->b_has_qf_entry & buf_has_flag)) {
-    return;
+    return false;
   }
   if (wp != NULL) {
-    if (wp->w_llist == NULL)
-      return;
+    if (wp->w_llist == NULL) {
+      return false;
+    }
     qi = wp->w_llist;
   }
 
@@ -2414,9 +2416,7 @@ void qf_mark_adjust(win_T *wp, linenr_T line1, linenr_T line2, long amount, long
         }
       }
 
-  if (!found_one) {
-    curbuf->b_has_qf_entry &= ~buf_has_flag;
-  }
+  return found_one;
 }
 
 /*