(fast_find_position): Backtrack to find first row if

charpos is inside a display overlay that spans multiple lines.

1 files changed, 22 insertions, 0 deletions

diff --git a/src/xdisp.c b/src/xdisp.c
index bf06bba7df3..b0e2039a8c9 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -20603,6 +20603,28 @@ fast_find_position (w, charpos, hpos, vpos, x, y, stop)
       past_end = 1;
     }
 
+  /* If whole rows or last part of a row came from a display overlay,
+     row_containing_pos will skip over such rows because their end pos
+     equals the start pos of the overlay or interval.  Backtrack if we
+     have a STOP object and previous row's end glyph came from STOP.  */
+  if (!NILP (stop))
+    {
+      struct glyph_row *prev = row-1;
+      while ((prev = row - 1, prev >= first)
+             && MATRIX_ROW_END_CHARPOS (prev) == charpos
+             && prev->used[TEXT_AREA] > 0)
+        {
+          end = prev->glyphs[TEXT_AREA];
+          glyph = end + prev->used[TEXT_AREA];
+          while (--glyph >= end
+                 && INTEGERP (glyph->object));
+          if (glyph < end
+              || !EQ (stop, glyph->object))
+            break;
+          row = prev;
+        }
+    }
+
   *x = row->x;
   *y = row->y;
   *vpos = MATRIX_ROW_VPOS (row, w->current_matrix);