Redone (generic) wxComboCtrl background painting and handling. The 'actual' wxWindow background colour is now largely ignored and overridden to refer the text-area's background colour instead (as is usually the case with controls like this). Base 'transparent' background is now only painted when double-buffered rendering is required, and otherwise delegated to the system, as appropriate. This should significantly improve control's appearance and compliancy with GTK+ and OS X themes and custom backgrounds.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67255 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/combo.h

@@ -445,6 +445,9 @@ public:
     // Return true if Create has finished
     bool IsCreated() const { return m_iFlags & wxCC_IFLAG_CREATED ? true : false; }
 
+    // Need to override to return text area background colour
+    wxColour GetBackgroundColour() const;
+
     // common code to be called on popup hide/dismiss
     void OnPopupDismiss(bool generateEvent);
 
@@ -671,6 +674,9 @@ protected:
     wxRect                  m_tcArea;
     wxRect                  m_btnArea;
 
+    // Colour of the the text area, in case m_text is NULL
+    wxColour                m_tcBgCol;
+
     // current button state (uses renderer flags)
     int                     m_btnState;