fix more x errors due to using an invalid background

1 files changed, 2 insertions, 0 deletions

diff --git a/src/FbTk/FbWindow.hh b/src/FbTk/FbWindow.hh
index 8f7376c..1f0c4bd 100644
--- a/src/FbTk/FbWindow.hh
+++ b/src/FbTk/FbWindow.hh
@@ -74,6 +74,8 @@ public:
     virtual ~FbWindow();
     virtual void setBackgroundColor(const FbTk::Color &bg_color);
     virtual void setBackgroundPixmap(Pixmap bg_pixmap);
+    // call when background is freed, and new one not ready yet
+    virtual void invalidateBackground();
     virtual void setBorderColor(const FbTk::Color &border_color);
     virtual void setBorderWidth(unsigned int size);
     /// set window name ("title")