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Finish debugging of cursor motion in bidi-reordered lines.

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xdisp.c (try_cursor_movement): Fix the logic.  Rewrite the loop
 over continuation lines in bidi-reordered buffers.  Return
 CURSOR_MOVEMENT_MUST_SCROLL upon failure to find a suitable row,
 rather than CURSOR_MOVEMENT_CANNOT_BE_USED.
This commit is contained in:
Eli Zaretskii 2010-05-29 13:49:21 +03:00
parent a85cde3870
commit 6d26bbb23e
2 changed files with 30 additions and 20 deletions
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11
src/ChangeLog
View file

@ -1,7 +1,14 @@
2010-05-29 Eli Zaretskii <eliz@gnu.org>
* xdisp.c (try_cursor_movement): Fix the logic. Rewrite the loop
over continuation lines in bidi-reordered buffers. Return
CURSOR_MOVEMENT_MUST_SCROLL upon failure to find a suitable row,
rather than CURSOR_MOVEMENT_CANNOT_BE_USED.
2010-05-28 Eli Zaretskii <eliz@gnu.org>
* xdisp.c (try_cursor_movement): Prevent unnecessary scrolling in
bidi-reordered buffers.
* xdisp.c (try_cursor_movement): Backup to non-continuation line
only after finding point's row.
2010-05-28 Kenichi Handa <handa@m17n.org>

39
src/xdisp.c
View file

@ -13767,7 +13767,7 @@ try_cursor_movement (window, startp, scroll_step)
if (rc == CURSOR_MOVEMENT_CANNOT_BE_USED)
{
int scroll_p = 0;
int scroll_p = 0, must_scroll = 0;
int last_y = window_text_bottom_y (w) - this_scroll_margin;
if (PT > XFASTINT (w->last_point))
@ -13860,6 +13860,7 @@ try_cursor_movement (window, startp, scroll_step)
{
/* if PT is not in the glyph row, give up. */
rc = CURSOR_MOVEMENT_MUST_SCROLL;
must_scroll = 1;
}
else if (rc != CURSOR_MOVEMENT_SUCCESS
&& !NILP (XBUFFER (w->buffer)->bidi_display_reordering))
@ -13883,17 +13884,17 @@ try_cursor_movement (window, startp, scroll_step)
line, give up. */
if (row <= w->current_matrix->rows)
{
rc = CURSOR_MOVEMENT_CANNOT_BE_USED;
rc = CURSOR_MOVEMENT_MUST_SCROLL;
break;
}
}
}
if (rc == CURSOR_MOVEMENT_SUCCESS
|| rc == CURSOR_MOVEMENT_CANNOT_BE_USED)
if (must_scroll)
;
else if (MATRIX_ROW_PARTIALLY_VISIBLE_P (w, row)
&& make_cursor_line_fully_visible_p)
else if (rc != CURSOR_MOVEMENT_SUCCESS
&& MATRIX_ROW_PARTIALLY_VISIBLE_P (w, row)
&& make_cursor_line_fully_visible_p)
{
if (PT == MATRIX_ROW_END_CHARPOS (row)
&& !row->ends_at_zv_p
@ -13919,7 +13920,8 @@ try_cursor_movement (window, startp, scroll_step)
}
else if (scroll_p)
rc = CURSOR_MOVEMENT_MUST_SCROLL;
else if (!NILP (XBUFFER (w->buffer)->bidi_display_reordering))
else if (rc != CURSOR_MOVEMENT_SUCCESS
&& !NILP (XBUFFER (w->buffer)->bidi_display_reordering))
{
/* With bidi-reordered rows, there could be more than
one candidate row whose start and end positions
@ -13932,8 +13934,11 @@ try_cursor_movement (window, startp, scroll_step)
do
{
rv |= set_cursor_from_row (w, row, w->current_matrix,
0, 0, 0, 0);
if (MATRIX_ROW_START_CHARPOS (row) <= PT
&& PT <= MATRIX_ROW_END_CHARPOS (row)
&& cursor_row_p (w, row))
rv |= set_cursor_from_row (w, row, w->current_matrix,
0, 0, 0, 0);
/* As soon as we've found the first suitable row
whose ends_at_zv_p flag is set, we are done. */
if (rv
@ -13944,19 +13949,17 @@ try_cursor_movement (window, startp, scroll_step)
}
++row;
}
while (MATRIX_ROW_BOTTOM_Y (row) < last_y
&& MATRIX_ROW_START_CHARPOS (row) <= PT
&& PT <= MATRIX_ROW_END_CHARPOS (row)
&& cursor_row_p (w, row));
while ((MATRIX_ROW_CONTINUATION_LINE_P (row)
&& MATRIX_ROW_BOTTOM_Y (row) <= last_y)
|| (MATRIX_ROW_START_CHARPOS (row) == PT
&& MATRIX_ROW_BOTTOM_Y (row) < last_y));
/* If we didn't find any candidate rows, or exited the
loop before all the candidates were examined, signal
to the caller that this method failed. */
if (rc != CURSOR_MOVEMENT_SUCCESS
&& (!rv
|| (MATRIX_ROW_START_CHARPOS (row) <= PT
&& PT <= MATRIX_ROW_END_CHARPOS (row))))
rc = CURSOR_MOVEMENT_CANNOT_BE_USED;
else
&& (!rv || MATRIX_ROW_CONTINUATION_LINE_P (row)))
rc = CURSOR_MOVEMENT_MUST_SCROLL;
else if (rv)
rc = CURSOR_MOVEMENT_SUCCESS;
}
else