remove event catcher when not needed

data/ui/Window.ui

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.22.1 -->
+<!-- Generated with glade 3.22.2 -->
 <interface>
   <requires lib="gtk+" version="3.20"/>
   <!-- interface-local-resource-path ../media -->
@@ -410,6 +410,7 @@
         <property name="height_request">1</property>
         <property name="can_focus">False</property>
         <property name="valign">start</property>
+        <property name="visible_window">False</property>
         <child>
           <placeholder/>
         </child>
@@ -418,7 +419,6 @@
     <child type="overlay">
       <object class="GtkEventBox" id="HeaderbarEventbox">
         <property name="height_request">60</property>
-        <property name="visible">True</property>
         <property name="can_focus">False</property>
         <property name="valign">start</property>
         <property name="visible_window">False</property>

uberwriter/main_window.py

@@ -568,6 +568,7 @@ class MainWindow(StyledWindow):
     def reveal_headerbar_bottombar(self, _widget=None, _data=None):
 
         def __reveal_hb():
+            self.headerbar_eventbox.hide()
             self.headerbar.hb_revealer.set_reveal_child(True)
             self.get_style_context().remove_class("focus")
             return False
@@ -603,7 +604,7 @@ class MainWindow(StyledWindow):
 
             self.bottombar_visible = False
 
-
+        self.headerbar_eventbox.show()
         self.buffer_modified_for_status_bar = False
 
     def on_delete_called(self, _widget, _data=None):