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messages: fix crashes with scrollback

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This commit is contained in:
Björn Linse
2019-09-03 19:27:12 +02:00
parent 72d7099abd
commit 5c8a57da81
1 changed files with 23 additions and 24 deletions
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47
src/nvim/message.c
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@@ -2217,37 +2217,36 @@ void msg_scroll_up(bool may_throttle)
/// we get throttling "for free" using standard redraw_win_later code paths.
void msg_scroll_flush(void)
{
if (!msg_grid.throttled) {
return;
}
msg_grid.throttled = false;
int pos_delta = msg_grid_pos_at_flush - msg_grid_pos;
assert(pos_delta >= 0);
int delta = MIN(msg_scrolled - msg_scrolled_at_flush, msg_grid.Rows);
if (msg_grid.throttled) {
msg_grid.throttled = false;
int pos_delta = msg_grid_pos_at_flush - msg_grid_pos;
assert(pos_delta >= 0);
int delta = MIN(msg_scrolled - msg_scrolled_at_flush, msg_grid.Rows);
if (pos_delta > 0) {
ui_ext_msg_set_pos(msg_grid_pos, true);
msg_grid_pos_at_flush = msg_grid_pos;
}
if (pos_delta > 0) {
ui_ext_msg_set_pos(msg_grid_pos, true);
}
int to_scroll = delta-pos_delta-msg_grid_scroll_discount;
assert(to_scroll >= 0);
int to_scroll = delta-pos_delta-msg_grid_scroll_discount;
assert(to_scroll >= 0);
// TODO(bfredl): msg_grid_pos should be 0 already when starting scrolling
// but this sometimes fails in "headless" message printing.
if (to_scroll > 0 && msg_grid_pos == 0) {
ui_call_grid_scroll(msg_grid.handle, 0, Rows, 0, Columns, to_scroll, 0);
}
// TODO(bfredl): msg_grid_pos should be 0 already when starting scrolling
// but this sometimes fails in "headless" message printing.
if (to_scroll > 0 && msg_grid_pos == 0) {
ui_call_grid_scroll(msg_grid.handle, 0, Rows, 0, Columns, to_scroll, 0);
}
for (int i = MAX(Rows-MAX(delta, 1), 0); i < Rows; i++) {
int row = i-msg_grid_pos;
assert(row >= 0);
ui_line(&msg_grid, row, 0, msg_grid.dirty_col[row], msg_grid.Columns,
HL_ATTR(HLF_MSG), false);
msg_grid.dirty_col[row] = 0;
for (int i = MAX(Rows-MAX(delta, 1), 0); i < Rows; i++) {
int row = i-msg_grid_pos;
assert(row >= 0);
ui_line(&msg_grid, row, 0, msg_grid.dirty_col[row], msg_grid.Columns,
HL_ATTR(HLF_MSG), false);
msg_grid.dirty_col[row] = 0;
}
}
msg_scrolled_at_flush = msg_scrolled;
msg_grid_scroll_discount = 0;
msg_grid_pos_at_flush = msg_grid_pos;
}
void msg_reset_scroll(void)