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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
include/snap.h
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@ -16,4 +16,7 @@ void snap_grow_to_next_edge(struct view *view,
void snap_shrink_to_next_edge(struct view *view,
enum view_edge direction, struct wlr_box *geo);
void snap_invalidate_edge_cache(struct view *view);
void snap_update_cache_geometry(struct view *view);
#endif /* LABWC_SNAP_H */