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Don't call QApplication::processEvents to update size hint

Nicolas Fella requested to merge work/nico/sizehint into master

The current code calls setSizePolicy and then resizes the dialog to the sizeHint.

However sizeHint is only updated asynchronously, so we use QApplication::processEvents to force that.

Processing the events this way can cause unforseen havoc, in particular it causes dialogs that use WA_DeleteOnClose to be closed too early, causing crashes.

Instead of force processing the events delay the setting of the new size one event loop iteration

BUG: 487135

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