Merge branch 'sys-theme-fixes'

Fix disabling system theme for wxMSW wxListCtrl.

See https://github.com/wxWidgets/wxWidgets/pull/1332

include/wx/systhemectrl.h

@@ -21,7 +21,21 @@ class WXDLLIMPEXP_FWD_CORE wxWindow;
 class WXDLLIMPEXP_CORE wxSystemThemedControlBase
 {
 public:
-    wxSystemThemedControlBase() { }
+    wxSystemThemedControlBase()
+    {
+#ifdef wxHAS_SYSTEM_THEMED_CONTROL
+        m_systemThemeDisabled = false;
+#endif // wxHAS_SYSTEM_THEMED_CONTROL
+    }
+
+    bool IsSystemThemeDisabled() const
+    {
+#ifdef wxHAS_SYSTEM_THEMED_CONTROL
+        return m_systemThemeDisabled;
+#else // !wxHAS_SYSTEM_THEMED_CONTROL
+        return false;
+#endif // wxHAS_SYSTEM_THEMED_CONTROL/!wxHAS_SYSTEM_THEMED_CONTROL
+    }
 
     virtual ~wxSystemThemedControlBase() { }
 
@@ -36,6 +50,11 @@ protected:
     (bool WXUNUSED(enable), wxWindow* WXUNUSED(window)) { }
 #endif // wxHAS_SYSTEM_THEMED_CONTROL
 
+private:
+#ifdef wxHAS_SYSTEM_THEMED_CONTROL
+    bool m_systemThemeDisabled;
+#endif // wxHAS_SYSTEM_THEMED_CONTROL
+
     wxDECLARE_NO_COPY_CLASS(wxSystemThemedControlBase);
 };
 
@@ -54,6 +73,14 @@ public:
     }
 
 protected:
+    void EnableSystemThemeByDefault()
+    {
+        // Check if the system theme hadn't been explicitly disabled before
+        // enabling it by default.
+        if ( !this->IsSystemThemeDisabled() )
+            DoEnableSystemTheme(true, this);
+    }
+
     wxDECLARE_NO_COPY_TEMPLATE_CLASS(wxSystemThemedControl, C);
 };