KEditTagsDialog: Avoid using QDialog::exec
QDialog::exec runs an event loop at waits for the dialog to be closed. Running another event loop is generally not recommended cause it can result in *other* events being process which one might not want. In this particular case the ResourceLoader, which runs in another thread, would emit the finished signal would result in the FileMetadataWidget deleting all its previous content, which would delete the TagWidget and its children aka the KEditTagsDialog => CRASH Instead we now set the windowModality and use QDialog::open, which returns immediately and then connect to the finished signal. Backported from nepomuk-widgets 2080bc1d4fe7c249c28930b18f03741c53025b13 BUG: 319336
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