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undo: make sure the current line is defined before it is referenced

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After undoing an <Enter> or redoing a line join, it is likely that the
"eaten" and freed line was the current line.  In fact, goto_line_posx()
should not refer to it any more, but... accommodate for this and just
set openfile->current to a valid value before calling goto_line_posx().

This fixes https://savannah.gnu.org/bugs/?62952.

Bug existed since version 6.3, commit eea3e1f0.
This commit is contained in:
Benno Schulenberg 2022-08-24 15:45:24 +02:00
parent 25ceefbd89
commit 9410a55679
1 changed files with 2 additions and 0 deletions
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2
src/text.c
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@ -540,6 +540,7 @@ void do_undo(void)
line->has_anchor |= line->next->has_anchor;
unlink_node(line->next);
renumber_from(line);
openfile->current = line;
goto_line_posx(u->head_lineno, original_x);
break;
case BACK:
@ -746,6 +747,7 @@ void do_redo(void)
strcat(line->data, u->strdata);
unlink_node(line->next);
renumber_from(line);
openfile->current = line;
goto_line_posx(u->tail_lineno, u->tail_x);
break;
case REPLACE: