From: Eli Zaretskii <eliz@gnu.org>
Date: Fri, 8 Sep 2017 13:15:23 +0000 (+0300)
Subject: Fix line-pixel-height for lines of variable height
X-Git-Tag: emacs-26.0.90~225
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=79150f6086286294c9e5ed56df5b14c87129cde6;p=emacs.git

Fix line-pixel-height for lines of variable height

* src/xdisp.c (Fline_pixel_height): Start moving from the
beginning of the screen line, to capture the full metrics of the
line.  (Bug#28391)
---

diff --git a/src/xdisp.c b/src/xdisp.c
index ad9b29835e7..5e8188cacb9 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -1195,6 +1195,10 @@ Value is the height in pixels of the line at point.  */)
     }
   SET_TEXT_POS (pt, PT, PT_BYTE);
   start_display (&it, w, pt);
+  /* Start from the beginning of the screen line, to make sure we
+     traverse all of its display elements, and thus capture the
+     correct metrics.  */
+  move_it_by_lines (&it, 0);
   it.vpos = it.current_y = 0;
   last_height = 0;
   result = make_number (line_bottom_y (&it));