Make sure we always set a default mime filter in save mode
KFileWidget::setMimeFilter() documentation says a default mime filter should be set if the dialog is being open in save mode. Without a default filter, the dialog uses a custom item (created by concatenating all the mime type filters) as default. This is not useful because it means an additional click for the user to select a filter that can actually be useful. If the initiallySelectedMimeTypeFilter() is empty, we use the first mime filter as fallback. Test Plan: tests/qfiledialogtest --mimeTypeFilter application/json --mimeTypeFilter application/zip --acceptMode save New unit test passes. Reviewers: #plasma, dfaure Differential Revision: https://phabricator.kde.org/D5956
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708ff0d0
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