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snap: cache and ignore last-snapped edge when growing or shrinking

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When growing or shrinking a view by snapping to an edge, a client may
ignore the requested size and instead keep its original size or
substitute a different (possibly constrained) size. In this case, the
view may not actually contact the snapped edge, and a subsequent snap
attempt will just keep re-trying (and failing) to contact the same ege.

To mitigate this, remember the last-snapped view, snapping direction and
offset of the snapping edge in snap.c; when re-attempting a snap for the
same view in the same direction, ignore the edge that was last "hit", to
allow snapping to progress beyond the problematic edge.
This commit is contained in:
Andrew J. Hesford 2024-04-02 15:58:50 -04:00 • committed by Johan Malm
parent 9de487cecf
commit 2bf285a2c6
11 changed files with 271 additions and 44 deletions
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3
src/view.c
View file

@ -13,6 +13,7 @@
#include "placement.h"
#include "regions.h"
#include "resize_indicator.h"
#include "snap-constraints.h"
#include "snap.h"
#include "ssd.h"
#include "view.h"
@ -2203,6 +2204,8 @@ view_destroy(struct view *view)
assert(view);
struct server *server = view->server;
snap_constraints_invalidate(view);
if (view->mappable.connected) {
mappable_disconnect(&view->mappable);
}