Stop crash/asserts caused when Clear() deletes the wxRegionRefData.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55537 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/src/generic/regiong.cpp b/src/generic/regiong.cpp
index 9511c83df2fb8c8dca41a8c52895676503dbc76e..d9ee1d95dea5c6d9a6a5e0c3678551eacfe634f6 100644 (file)
--- a/src/generic/regiong.cpp
+++ b/src/generic/regiong.cpp
@@ -274,6 +274,8 @@ wxRegionGeneric::wxRegionGeneric(const wxPoint& topLeft, const wxPoint& bottomRi
 void wxRegionGeneric::Clear()
 {
     UnRef();
+    if (!m_refData)
+        m_refData = new wxRegionRefData(wxRect(0,0,0,0));
 }
 
 wxGDIRefData *wxRegionGeneric::CreateGDIRefData() const