Fix hscrolling of :align-to when display-line-numbers is in effect

* src/dispextern.h (struct it): Rename 'tab_offset' member to
'stretch_adjust'.
* src/xdisp.c (gui_produce_glyphs, produce_stretch_glyph)
(display_line): All users of 'tab_offset' changed.
(produce_stretch_glyph): Fix calculation of ':align-to' when
line numbers are displayed and the window is hscrolled.
(calc_pixel_width_or_height): Fix calculation of width of 'space'
display property when 'display-line-numbers' is turned on, but the
line number was not yet produced for the current glyph row.
(Bug#56176)

1 files changed, 5 insertions, 5 deletions

diff --git a/src/dispextern.h b/src/dispextern.h
index 9dec8b7d129..ca7834dec55 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -2742,11 +2742,11 @@ struct it
   /* The line number of point's line, or zero if not computed yet.  */
   ptrdiff_t pt_lnum;
 
-  /* Number of pixels to offset tab stops due to width fixup of the
-     first glyph that crosses first_visible_x.  This is only needed on
-     GUI frames, only when display-line-numbers is in effect, and only
-     in hscrolled windows.  */
-  int tab_offset;
+  /* Number of pixels to adjust tab stops and stretch glyphs due to
+     width fixup of the first stretch glyph that crosses first_visible_x.
+     This is only needed on GUI frames, only when display-line-numbers
+     is in effect, and only in hscrolled windows.  */
+  int stretch_adjust;
 
   /* Left fringe bitmap number (enum fringe_bitmap_type).  */
   unsigned left_user_fringe_bitmap : FRINGE_ID_BITS;