TitleAreaDialog: fix Widget is disposed on close #1094 #2601

Job	Run time
check-merge-commits / Block Merge Commits	9s
build / Upload Event File	2s
build / Verify Linux	24m 21s
build / Verify Windows	33m 45s
check-freeze-period / verify-freeze-period	2s
build / Verify MacOS	1h 14m 55s
	2h 13m 14s

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