QgsProjectionSelectionTreeWidget.__attribute_docs__={'crsSelected':'Emitted when a projection is selected in the widget.\n','initialized':'Notifies others that the widget is now fully initialized, including deferred selection of projection.\n\n.. deprecated:: 3.40\n\n No longer emitted.\n','projectionDoubleClicked':'Emitted when a projection is double clicked in the list.\n','hasValidSelectionChanged':'Emitted when the selection in the tree is changed from a valid selection to an invalid selection, or vice-versa.\n\n.. versionadded:: 3.18\n'}