FIX: handle mouseCaptureLost in common ctrls

Change-Id: Ifde2406911a628fa61acf41c0e7a5120612d73bf

src/slic3r/GUI/Widgets/Button.cpp

@@ -7,6 +7,7 @@ BEGIN_EVENT_TABLE(Button, StaticBox)
 
 EVT_LEFT_DOWN(Button::mouseDown)
 EVT_LEFT_UP(Button::mouseReleased)
+EVT_MOUSE_CAPTURE_LOST(Button::mouseCaptureLost)
 EVT_KEY_DOWN(Button::keyDownUp)
 EVT_KEY_UP(Button::keyDownUp)
 
@@ -242,12 +243,19 @@ void Button::mouseReleased(wxMouseEvent& event)
     event.Skip();
     if (pressedDown) {
         pressedDown = false;
-        ReleaseMouse();
+        if (HasCapture())
+            ReleaseMouse();
         if (wxRect({0, 0}, GetSize()).Contains(event.GetPosition()))
             sendButtonEvent();
     }
 }
 
+void Button::mouseCaptureLost(wxMouseCaptureLostEvent &event)
+{
+    wxMouseEvent evt;
+    mouseReleased(evt);
+}
+
 void Button::keyDownUp(wxKeyEvent &event)
 {
     if (event.GetKeyCode() == WXK_SPACE || event.GetKeyCode() == WXK_RETURN) {