Fix deleting wxPG properties with sub-properties.

If property contains sub-properties they should be deselected prior deleting the property.

See #16617.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78083 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/propgrid/propgridpagestate.h

@@ -697,6 +697,13 @@ protected:
     wxPGProperty* BaseGetPropertyByLabel( const wxString& label,
                                       wxPGProperty* parent = NULL ) const;
 
+    /** Unselect sub-properties */
+    void DoRemoveChildrenFromSelection(wxPGProperty* p, bool recursive,
+                                       int selFlags);
+
+    /** Mark sub-properties as being deleted */
+    void DoMarkChildrenAsDeleted(wxPGProperty* p, bool recursive);
+
     /** If visible, then this is pointer to wxPropertyGrid.
         This shall *never* be NULL to indicate that this state is not visible.
     */