Merge #11303 from janlazo/vim-8.1.1245

vim-patch:8.1.{1245,2154}

src/nvim/quickfix.c

@@ -3164,7 +3164,9 @@ static int qf_goto_cwindow(const qf_info_T *qi, bool resize, int sz,
       if (sz != win->w_width) {
         win_setwidth(sz);
       }
-    } else if (sz != win->w_height) {
+    } else if (sz != win->w_height
+               && (win->w_height + win->w_status_height + tabline_height()
+                   < cmdline_row)) {
       win_setheight(sz);
     }
   }

src/nvim/testdir/test_quickfix.vim

@@ -273,6 +273,27 @@ func Test_cwindow()
   call XwindowTests('l')
 endfunc
 
+func Test_copenHeight()
+  copen
+  wincmd H
+  let height = winheight(0)
+  copen 10
+  call assert_equal(height, winheight(0))
+  quit
+endfunc
+
+func Test_copenHeight_tabline()
+  set tabline=foo showtabline=2
+  copen
+  wincmd H
+  let height = winheight(0)
+  copen 10
+  call assert_equal(height, winheight(0))
+  quit
+  set tabline& showtabline&
+endfunc
+
+
 " Tests for the :cfile, :lfile, :caddfile, :laddfile, :cgetfile and :lgetfile
 " commands.
 func XfileTests(cchar)