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WidgetsAskUserActionHandler: Use QPointer to check the validity of parent widgets

Akseli Lahtinen requested to merge work/akselmo/fix-kio-crash-dolphin-closed into master

If Dolphin is closed during the copying process, and the overwrite/skip dialog appears, this crashes the copying process since the parent shows to faulty location.

Use QPointer to check that the parent widgets are still valid. If not, we just use nullptr, and the dialogs will still open.

This also cleans some repetition in code.

BUG:448532

Edited by Akseli Lahtinen

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