Reset the expander column when clearing columns in generic wxDVC.

The expander column becomes invalid when all columns are cleared, don't keep
a dangling pointer.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69165 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/src/generic/datavgen.cpp b/src/generic/datavgen.cpp
index 6f44e1d13ed094efa24154dec34da6d877007bdb..745e38b4706fddfe0df7a7d18381175cf70231e8 100644 (file)
--- a/src/generic/datavgen.cpp
+++ b/src/generic/datavgen.cpp
@@ -4357,6 +4357,7 @@ bool wxDataViewCtrl::DeleteColumn( wxDataViewColumn *column )
 
 bool wxDataViewCtrl::ClearColumns()
 {
+    SetExpanderColumn(NULL);
     m_cols.Clear();
     m_colsBestWidths.clear();
     OnColumnsCountChanged();