Removed dysfunctional wxPGPropery::PrepareValueForDialogEditing(); Replaced its functionality with wxPropertyGrid::GetPendingEditedValue(); Added wxPropertyGrid::PerformValidation() flags so it can be called in generic context.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56169 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/propgrid/propgrid.h

@@ -586,6 +586,14 @@ public:
     */
     wxColour GetMarginColour() const;
 
+    /**
+        Returns most up-to-date value of selected property. This will return
+        value different from GetSelectedProperty()->GetValue() only when text
+        editor is activate and string edited by user represents valid,
+        uncommitted property value.
+    */
+    wxVariant GetPendingEditedValue();
+
     /**
         Returns cell background colour of a property.
     */