[pango/line-breaking-fixes: 9/12] Handle break-after-space correctly

[Matthias Clasen <matthiasc src gnome org>]

commit afc19960c553f6616fc692e42705304d9e250c45
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Nov 12 13:55:22 2021 -0500

    Handle break-after-space correctly
    
    When we are breaking after a space, we should not
    count the width of the space towards the line,
    since we are zeroing it later.

 pango/pango-layout.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
---
diff --git a/pango/pango-layout.c b/pango/pango-layout.c
index a8c0f757..3059d08f 100644
--- a/pango/pango-layout.c
+++ b/pango/pango-layout.c
@@ -3752,7 +3752,11 @@ find_break_extra_width (PangoLayout    *layout,
                         ParaBreakState *state,
                         int             pos)
 {
-  /* Check whether to insert a hyphen */
+  /* Check whether to insert a hyphen,
+   * or whether we are breaking after one of those
+   * characters that turn into a hyphen,
+   * or after a space.
+  */
   if (layout->log_attrs[state->start_offset + pos].break_inserts_hyphen)
     {
       ensure_hyphen_width (state);
@@ -3762,6 +3766,11 @@ find_break_extra_width (PangoLayout    *layout,
       else
         return state->hyphen_width;
     }
+  else if (state->start_offset + pos > 0 &&
+           layout->log_attrs[state->start_offset + pos - 1].is_white)
+    {
+      return - state->log_widths[state->log_widths_offset + pos - 1];
+    }
 
   return 0;
 }