Nyall Dawson 784c844e30 Fix crash when certain symbol pages are open in style dock, eg
categorized class symbol editors, and QGIS is closed or a new project
opened

The symbol ownership of QgsSymbolSelectorWidget is very messy, and
we can't fix till 4.0. Workaround this by introducing a temporary
API to transfer symbol ownership to the widget.
2023-09-29 10:40:07 +10:00
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