[pango/visible-things] layout: Don't zero the width of visible space

[Matthias Clasen <matthiasc src gnome org>]

commit c9c98a6f1de722145077ed71c3640b58406c0b34
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Jul 8 15:27:22 2019 -0400

    layout: Don't zero the width of visible space
    
    Without this, we are getting the [LS] hex box
    rendered on top of the last character in a line,
    when the line separator ends up being visible.

 pango/pango-layout.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/pango/pango-layout.c b/pango/pango-layout.c
index dcfe6c63..51cea4ce 100644
--- a/pango/pango-layout.c
+++ b/pango/pango-layout.c
@@ -5251,6 +5251,10 @@ zero_line_final_space (PangoLayoutLine *line,
   PangoGlyphString *glyphs = run->glyphs;
   int glyph = item->analysis.level % 2 ? 0 : glyphs->num_glyphs - 1;
 
+  if ((glyphs->glyphs[glyph].glyph & PANGO_GLYPH_UNKNOWN_FLAG) &&
+      (glyphs->glyphs[glyph].glyph != PANGO_GET_UNKNOWN_GLYPH (0x20)))
+    return; /* this space is visible */
+
   /* if the final char of line forms a cluster, and it's
    * a whitespace char, zero its glyph's width as it's been wrapped
    */