Sway maintains a list of pending transactions, and tries to merge consecutive transactions applying to the same views into one. Given a pending transactions list on views {A, B, C} of: A -> A' -> A'' -> B -> B' -> B'' Sway will collapse the transactions into just A'' -> B''. This works fine when doing things like resizing views by their border. However, when interactively resizing layouts like H[V[A B] C], we end up with pending transaction lists like: A -> B -> C -> A' -> B' -> C' -> A'' -> B'' -> C'' Previously, Sway would not be able to simplify this transaction list, and execute many more transactions than would be necessary (the final state is determined by {A'', B'', C''}). After this commit, the transaction list gets simplified to A'' -> B'' -> C'', resolving performance problems (that were particularly noticeable with high-refresh-rate mice). Fixes #5736.master
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