Fix syncing the colors of a buffer when it is open in multiple tabs

autoload/coquille.vim

@@ -697,6 +697,16 @@ function! coquille#SyncWindowColors(winid, hint_tabnr, hint_winnr)
             let l:cur_win = winnr()
             let l:cur_winid = coquille#WinGetId(l:cur_tab, l:cur_win)
             call coquille#WinGoToId(a:winid, l:tabwin[0], l:tabwin[1])
+            let l:cur_tab2 = tabpagenr()
+            let l:cur_win2 = winnr()
+        endif
+        " Switching the window could have triggered the colors to get synced.
+        " So double check that they need to be synced.
+        let l:win_value = coquille#GetWinVar(a:winid, tabpagenr(), winnr(),
+                    \                        l:group, [s:empty_range, -1])
+        if l:win_value[0] == l:buf_value
+            " It already matches; nothing to do
+            continue
         endif
         if l:win_value[1] != -1
             call matchdelete(l:win_value[1])