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container_at_stacked: skip titles when zero pixels

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It is possible to make the title bars have a zero pixel height while
stacked, by using a blank font and no padding. This causes a division by
zero when attempting to calculate the child index in
container_at_stacked, which then results in a segfault when attempting
to access the child at that bad index (INT_MIN). This just skips the
check to see if the cursor is over a title bar of a child of a stacked
container when the title bar height is zero since there will be no title
bars.
This commit is contained in:
Brian Ashworth 2019-02-08 22:29:35 -05:00 • committed by emersion
parent f5190d1f79
commit 995b6edab6
1 changed files with 6 additions and 4 deletions
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10
sway/tree/container.c
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@ -251,10 +251,12 @@ static struct sway_container *container_at_stacked(struct sway_node *parent,
// Title bars // Title bars
int title_height = container_titlebar_height(); int title_height = container_titlebar_height();
int child_index = (ly - box.y) / title_height; if (title_height > 0) {
if (child_index < children->length) { int child_index = (ly - box.y) / title_height;
struct sway_container *child = children->items[child_index]; if (child_index < children->length) {
return child; struct sway_container *child = children->items[child_index];
return child;
}
} }
// Surfaces // Surfaces