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shell: Only assign focus on touch if there is a touch focus surface
Similar to 7c4f6cc145
, if we don't have
a background image from the desktop-shell client or the touch point
for some other reason doesn't hit a surface we trigger a
segfault as we try to deref the seat->touch->focus NULL pointer.
For touch, another problem could be fudgey calibration that ends up
giving touch coordinates outside the output space.
https://bugs.freedesktop.org/show_bug.cgi?id=72839
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@ -4229,6 +4229,8 @@ touch_to_activate_binding(struct weston_seat *seat, uint32_t time, void *data)
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{
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if (seat->touch->grab != &seat->touch->default_grab)
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return;
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if (seat->touch->focus == NULL)
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return;
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activate_binding(seat, data, seat->touch->focus->surface);
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}
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