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terminal: expand scrollback when scrolling

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If configured to do so, expand the scrollback capacity
in order to hold the new rows without losing past output.
This commit is contained in:
Matheus Afonso Martins Moreira 2024-04-07 11:45:14 -03:00
parent 800b7c423a
commit c8c9d1bebe
1 changed files with 9 additions and 1 deletions
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10
terminal.c
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@ -2815,6 +2815,8 @@ term_scroll_partial(struct terminal *term, struct scroll_region region, int rows
/* Verify scroll amount has been clamped */
xassert(rows <= region.end - region.start);
bool expanded = term_expand_scrollback_capacity_if_needed(term, rows);
/* Cancel selections that cannot be scrolled */
if (unlikely(term->selection.coords.end.row >= 0)) {
/*
@ -2838,7 +2840,13 @@ term_scroll_partial(struct terminal *term, struct scroll_region region, int rows
bool view_follows = term->grid->view == term->grid->offset;
term->grid->offset += rows;
term->grid->offset &= term->grid->num_rows - 1;
if (!expanded) {
/* Additional capacity was not allocated.
* Clamp down the offset and wrap it around
* so that old output lines are reused.
*/
term->grid->offset &= term->grid->num_rows - 1;
}
if (likely(view_follows)) {
term_damage_scroll(term, DAMAGE_SCROLL, region, rows);