(x_produce_glyphs): Handle the case when font has no space character

in calculating tabs.

1 files changed, 26 insertions, 18 deletions

diff --git a/src/xdisp.c b/src/xdisp.c
index 2f809e3a096..d4bdde452b5 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -21367,25 +21367,33 @@ x_produce_glyphs (it)
         }
       else if (it->char_to_display == '\t')
         {
-          int tab_width = it->tab_width * font->space_width;
-          int x = it->current_x + it->continuation_lines_width;
-          int next_tab_x = ((1 + x + tab_width - 1) / tab_width) * tab_width;
-
-          /* If the distance from the current position to the next tab
-             stop is less than a space character width, use the
-             tab stop after that.  */
-          if (next_tab_x - x < font->space_width)
-            next_tab_x += tab_width;
-
-          it->pixel_width = next_tab_x - x;
-          it->nglyphs = 1;
-          it->ascent = it->phys_ascent = FONT_BASE (font) + boff;
-          it->descent = it->phys_descent = FONT_DESCENT (font) - boff;
-
-          if (it->glyph_row)
+          if (font->space_width > 0)
+            {
+              int tab_width = it->tab_width * font->space_width;
+              int x = it->current_x + it->continuation_lines_width;
+              int next_tab_x = ((1 + x + tab_width - 1) / tab_width) * tab_width;
+
+              /* If the distance from the current position to the next tab
+                 stop is less than a space character width, use the
+                 tab stop after that.  */
+              if (next_tab_x - x < font->space_width)
+                next_tab_x += tab_width;
+
+              it->pixel_width = next_tab_x - x;
+              it->nglyphs = 1;
+              it->ascent = it->phys_ascent = FONT_BASE (font) + boff;
+              it->descent = it->phys_descent = FONT_DESCENT (font) - boff;
+
+              if (it->glyph_row)
+                {
+                  append_stretch_glyph (it, it->object, it->pixel_width,
+                                        it->ascent + it->descent, it->ascent);
+                }
+            }
+          else
             {
-              append_stretch_glyph (it, it->object, it->pixel_width,
-                                    it->ascent + it->descent, it->ascent);
+              it->pixel_width = 0;
+              it->nglyphs = 1;
             }
         }
       else