vim-patch:8.1.0554: popup menu overlaps with preview window

Problem:    Popup menu overlaps with preview window.
Solution:   Adjust the height computation. (Hirohito Higashi, closes vim/vim#3414)
614ab8aa00

Cherry-picked "row -> pum_win_row" rename changes from patch 8.1.0062.

src/nvim/popupmnu.c

@@ -100,7 +100,7 @@ void pum_display(pumitem_T *array, int size, int selected, bool array_changed,
   int above_row;
   int below_row;
   int redo_count = 0;
-  int row;
+  int pum_win_row;
   int col;
 
   if (!pum_is_visible) {
@@ -121,12 +121,12 @@ void pum_display(pumitem_T *array, int size, int selected, bool array_changed,
 
     // wildoptions=pum
     if (State == CMDLINE) {
-      row = ui_has(kUICmdline) ? 0 : cmdline_row;
+      pum_win_row = ui_has(kUICmdline) ? 0 : cmdline_row;
       col = cmd_startcol;
       pum_anchor_grid = ui_has(kUICmdline) ? -1 : DEFAULT_GRID_HANDLE;
     } else {
       // anchor position: the start of the completed word
-      row = curwin->w_wrow;
+      pum_win_row = curwin->w_wrow;
       if (curwin->w_p_rl) {
         col = curwin->w_width - curwin->w_wcol - 1;
       } else {
@@ -136,7 +136,7 @@ void pum_display(pumitem_T *array, int size, int selected, bool array_changed,
       pum_anchor_grid = (int)curwin->w_grid.handle;
       if (!ui_has(kUIMultigrid)) {
         pum_anchor_grid = (int)default_grid.handle;
-        row += curwin->w_winrow;
+        pum_win_row += curwin->w_winrow;
         col += curwin->w_wincol;
       }
     }
@@ -152,7 +152,8 @@ void pum_display(pumitem_T *array, int size, int selected, bool array_changed,
           ADD(item, STRING_OBJ(cstr_to_string((char *)array[i].pum_info)));
           ADD(arr, ARRAY_OBJ(item));
         }
-        ui_call_popupmenu_show(arr, selected, row, col, pum_anchor_grid);
+        ui_call_popupmenu_show(arr, selected, pum_win_row, col,
+                               pum_anchor_grid);
       } else {
         ui_call_popupmenu_select(selected);
         return;
@@ -188,11 +189,11 @@ void pum_display(pumitem_T *array, int size, int selected, bool array_changed,
       pum_height = (int)p_ph;
     }
 
-    // Put the pum below "row" if possible.  If there are few lines decide on
-    // where there is more room.
-    if (row + 2 >= below_row - pum_height
-        && row - above_row > (below_row - above_row) / 2) {
-      // pum above "row"
+    // Put the pum below "pum_win_row" if possible.
+    // If there are few lines decide on where there is more room.
+    if (pum_win_row + 2 >= below_row - pum_height
+        && pum_win_row - above_row > (below_row - above_row) / 2) {
+      // pum above "pum_win_row"
       pum_above = true;
 
       // Leave two lines of context if possible
@@ -202,12 +203,12 @@ void pum_display(pumitem_T *array, int size, int selected, bool array_changed,
         context_lines = curwin->w_wrow - curwin->w_cline_row;
       }
 
-      if (row >= size + context_lines) {
-        pum_row = row - size - context_lines;
+      if (pum_win_row >= size + context_lines) {
+        pum_row = pum_win_row - size - context_lines;
         pum_height = size;
       } else {
         pum_row = 0;
-        pum_height = row - context_lines;
+        pum_height = pum_win_row - context_lines;
       }
 
       if ((p_ph > 0) && (pum_height > p_ph)) {
@@ -215,7 +216,7 @@ void pum_display(pumitem_T *array, int size, int selected, bool array_changed,
         pum_height = (int)p_ph;
       }
     } else {
-      // pum below "row"
+      // pum below "pum_win_row"
       pum_above = false;
 
       // Leave two lines of context if possible
@@ -226,7 +227,7 @@ void pum_display(pumitem_T *array, int size, int selected, bool array_changed,
           + curwin->w_cline_height - curwin->w_wrow;
       }
 
-      pum_row = row + context_lines;
+      pum_row = pum_win_row + context_lines;
       if (size > below_row - pum_row) {
         pum_height = below_row - pum_row;
       } else {
@@ -243,16 +244,10 @@ void pum_display(pumitem_T *array, int size, int selected, bool array_changed,
       return;
     }
 
-    // If there is a preview window above, avoid drawing over it.
-    // Do keep at least 10 entries.
-    if (pvwin != NULL && pum_row < above_row && pum_height > 10) {
-      if (row - above_row < 10) {
-        pum_row = row - 10;
-        pum_height = 10;
-      } else {
+    // If there is a preview window above avoid drawing over it.
+    if (pvwin != NULL && pum_row < above_row && pum_height > above_row) {
       pum_row = above_row;
-        pum_height = row - above_row;
-      }
+      pum_height = pum_win_row - above_row;
     }
     if (pum_external) {
       return;

src/nvim/testdir/test_popup.vim

@@ -733,6 +733,28 @@ func Test_popup_and_preview_autocommand()
   bw!
 endfunc
 
+func Test_popup_and_previewwindow_dump()
+  if !CanRunVimInTerminal()
+    return
+  endif
+  call writefile([
+    \ 'set previewheight=9',
+    \ 'silent! pedit',
+    \ 'call setline(1, map(repeat(["ab"], 10), "v:val. v:key"))',
+    \ 'exec "norm! G\<C-E>\<C-E>"',
+	\ ], 'Xscript')
+  let buf = RunVimInTerminal('-S Xscript', {})
+
+  " Test that popup and previewwindow do not overlap.
+  call term_sendkeys(buf, "o\<C-X>\<C-N>")
+  sleep 100m
+  call VerifyScreenDump(buf, 'Test_popup_and_previewwindow_01', {})
+
+  call term_sendkeys(buf, "\<Esc>u")
+  call StopVimInTerminal(buf)
+  call delete('Xscript')
+endfunc
+
 func Test_popup_position()
   if !CanRunVimInTerminal()
     return

test/functional/ui/popupmenu_spec.lua

@@ -739,16 +739,16 @@ describe('builtin popupmenu', function()
       ee                              |
       ff                              |
       gg                              |
-      {s:aa             }                 |
-      {n:bb             }{3:iew][+]          }|
-      {n:cc             }                 |
-      {n:dd             }                 |
-      {n:ee             }                 |
-      {n:ff             }                 |
-      {n:gg             }                 |
-      {n:hh             }                 |
-      {n:ii             }                 |
-      {n:jj             }                 |
+      hh                              |
+      {s:aa             }{c: }{3:ew][+]          }|
+      {n:bb             }{c: }                |
+      {n:cc             }{c: }                |
+      {n:dd             }{c: }                |
+      {n:ee             }{c: }                |
+      {n:ff             }{c: }                |
+      {n:gg             }{c: }                |
+      {n:hh             }{c: }                |
+      {n:ii             }{s: }                |
       aa^                              |
       {4:[No Name] [+]                   }|
       {2:-- }{5:match 1 of 10}                |