Patch 8.2.0857
Problem:    GTK cell height can be a pixel too much.
Solution:   Subtract 3 instead of 1 when rounding. (closes #6168)
Files:      src/gui_gtk_x11.c


*** ../vim-8.2.0856/src/gui_gtk_x11.c   2020-05-30 19:52:42.270340843 +0200
--- src/gui_gtk_x11.c   2020-05-31 13:52:45.492253249 +0200
***************
*** 4711,4717 ****
  
      pango_font_metrics_unref(metrics);
  
!     gui.char_height = (ascent + descent + PANGO_SCALE - 1) / PANGO_SCALE
                                                                + p_linespace;
      // LINTED: avoid warning: bitwise operation on signed value
      gui.char_ascent = PANGO_PIXELS(ascent + p_linespace * PANGO_SCALE / 2);
--- 4711,4718 ----
  
      pango_font_metrics_unref(metrics);
  
!     // Round up, but not when the value is very close (e.g. 15.0009).
!     gui.char_height = (ascent + descent + PANGO_SCALE - 3) / PANGO_SCALE
                                                                + p_linespace;
      // LINTED: avoid warning: bitwise operation on signed value
      gui.char_ascent = PANGO_PIXELS(ascent + p_linespace * PANGO_SCALE / 2);
*** ../vim-8.2.0856/src/version.c       2020-05-31 13:09:43.894293957 +0200
--- src/version.c       2020-05-31 13:52:12.904389429 +0200
***************
*** 748,749 ****
--- 748,751 ----
  {   /* Add new patch number below this line */
+ /**/
+     857,
  /**/

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