Andreas Kling b0cdb6b074 LibGUI: Deduplicate widgets with proxied focus in focus chain ...

When computing the chain of focusable widgets in a window, only include
each widget once (to avoid loops) and resolve focus proxies immediately
instead of lazily. This prevents the focus from getting stuck when
cycling backwards and hitting a proxy that points forward.

2020-10-30 19:17:09 +01:00

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