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Fix posn-at-point at beginning of a display string

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* src/xdisp.c (pos_visible_p): Account for the line-number width
when the display string at CHARPOS ends in a newline.  (Bug#42039)
This commit is contained in:
Eli Zaretskii 2020-06-26 15:01:44 +03:00
parent 0c4b033670
commit bb1a9481c9
1 changed files with 14 additions and 4 deletions
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18
src/xdisp.c
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@ -1782,6 +1782,12 @@ pos_visible_p (struct window *w, ptrdiff_t charpos, int *x, int *y,
start_display (&it3, w, top);
if (start > CHARPOS (top))
move_it_to (&it3, start - 1, -1, -1, -1, MOVE_TO_POS);
/* Record the line-number width, if any. Do it here,
before subsequent calls to start_display etc. reset
the line_number_produced_p flag, and we can no
longer be sure we are not using stale info. */
int lnum_pixel_width =
it3.line_number_produced_p ? it3.lnum_pixel_width : 0;
/* Move forward one more line if the position before
the display string is a newline or if it is the
rightmost character on a line that is
@ -1850,10 +1856,14 @@ pos_visible_p (struct window *w, ptrdiff_t charpos, int *x, int *y,
top_x = it3.current_x - it3.pixel_width;
/* Account for line-number display, if IT3 still
didn't. This can happen if START - 1 is the
first character on its display line. */
if (!it3.line_number_produced_p
&& it.line_number_produced_p)
top_x += it.lnum_pixel_width;
first or the last character on its display line. */
if (!it3.line_number_produced_p)
{
if (lnum_pixel_width > 0)
top_x += lnum_pixel_width;
else if (it.line_number_produced_p)
top_x += it.lnum_pixel_width;
}
/* Normally, we would exit the above loop because we
found the display element whose character
position is CHARPOS. For the contingency that we