[swell-foop] Do not allow keyboard control with menu open

[Robert Roth <robertroth src gnome org>]

commit 554e9c92e7fcc41c784b24455afafc099076f207
Author: Robert Roth <robert roth bee-tf ro>
Date:   Tue May 12 08:47:09 2020 +0300

    Do not allow keyboard control with menu open

 src/window.vala | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/window.vala b/src/window.vala
index 9775412..88731ed 100644
--- a/src/window.vala
+++ b/src/window.vala
@@ -339,6 +339,9 @@ private class SwellFoopWindow : ApplicationWindow
 
     private inline bool on_key_pressed (EventControllerKey _key_controller, uint keyval, uint keycode, 
Gdk.ModifierType state)
     {
+        if (hamburger_button.get_active())
+            return false;
+
         switch (keyval)
         {
             case Gdk.Key.F2: