Update ruler button status messages if changed by keystroke and...

... pointer is in it

src/widgets/AButton.h

@@ -99,6 +99,11 @@ class AButton final : public wxWindow {
    void OnPaint(wxPaintEvent & event);
    void OnSize(wxSizeEvent & event);
    void OnMouseEvent(wxMouseEvent & event);
+
+   // Update the status bar message if the pointer is in the button.
+   // Else do nothing.
+   void UpdateStatus();
+
    void OnCaptureLost(wxMouseCaptureLostEvent & event);
    void OnKeyDown(wxKeyEvent & event);
    void OnSetFocus(wxFocusEvent & event);