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Fix visual-order cursor movement when lines are truncated

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* src/xdisp.c (Fmove_point_visually): When lines are truncated,
simulate display in a window of infinite width, to allow move_it_*
functions reach positions outside of normal window dimensions.
Remove code that tried to handle a subset of these situations by
manual iteration of buffer text.  (Bug#17777)
This commit is contained in:
Eli Zaretskii 2015-07-18 15:17:26 +03:00
parent 166ffcb6c7
commit a65e00b9f9
1 changed files with 10 additions and 21 deletions
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31
src/xdisp.c
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@ -21291,6 +21291,14 @@ Value is the new character position of point. */)
/* Setup the arena. */
SET_TEXT_POS (pt, PT, PT_BYTE);
start_display (&it, w, pt);
/* When lines are truncated, we could be called with point
outside of the windows edges, in which case move_it_*
functions either prematurely stop at window's edge or jump to
the next screen line, whereas we rely below on our ability to
reach point, in order to start from its X coordinate. So we
need to disregard the window's horizontal extent in that case. */
if (it.line_wrap == TRUNCATE)
it.last_visible_x = INFINITY;
if (it.cmp_it.id < 0
&& it.method == GET_FROM_STRING
@ -21382,6 +21390,8 @@ Value is the new character position of point. */)
if (pt_x > 0)
{
start_display (&it, w, pt);
if (it.line_wrap == TRUNCATE)
it.last_visible_x = INFINITY;
reseat_at_previous_visible_line_start (&it);
it.current_x = it.current_y = it.hpos = 0;
if (pt_vpos != 0)
@ -21494,27 +21504,6 @@ Value is the new character position of point. */)
if (it.current_x != target_x)
move_it_in_display_line_to (&it, ZV, target_x, MOVE_TO_POS | MOVE_TO_X);
/* When lines are truncated, the above loop will stop at the
window edge. But we want to get to the end of line, even if
it is beyond the window edge; automatic hscroll will then
scroll the window to show point as appropriate. */
if (target_is_eol_p && it.line_wrap == TRUNCATE
&& get_next_display_element (&it))
{
struct text_pos new_pos = it.current.pos;
while (!ITERATOR_AT_END_OF_LINE_P (&it))
{
set_iterator_to_next (&it, false);
if (it.method == GET_FROM_BUFFER)
new_pos = it.current.pos;
if (!get_next_display_element (&it))
break;
}
it.current.pos = new_pos;
}
/* If we ended up in a display string that covers point, move to
buffer position to the right in the visual order. */
if (dir > 0)