diff -r 27fb1c3c9fbb -r 97b591813c8b src/mainwindow.ui
--- a/src/mainwindow.ui	Sun Mar 13 20:26:28 2022 +0200
+++ b/src/mainwindow.ui	Tue Mar 15 18:52:48 2022 +0200
@@ -30,7 +30,7 @@
      <x>0</x>
      <y>0</y>
      <width>800</width>
-     <height>31</height>
+     <height>27</height>
     </rect>
    </property>
    <widget class="QMenu" name="menuFile">
@@ -69,6 +69,7 @@
     <property name="title">
      <string>Edit</string>
     </property>
+    <addaction name="actionInvert"/>
     <addaction name="actionDelete"/>
     <addaction name="separator"/>
     <addaction name="actionGridFine"/>
@@ -120,6 +121,7 @@
    <attribute name="toolBarBreak">
     <bool>false</bool>
    </attribute>
+   <addaction name="actionInvert"/>
    <addaction name="actionDelete"/>
    <addaction name="actionGridFine"/>
    <addaction name="actionGridMedium"/>
@@ -312,6 +314,15 @@
     <string>Ctrl+3</string>
    </property>
   </action>
+  <action name="actionInvert">
+   <property name="icon">
+    <iconset resource="../ldforge.qrc">
+     <normaloff>:/icons/invert.png</normaloff>:/icons/invert.png</iconset>
+   </property>
+   <property name="text">
+    <string>Invert</string>
+   </property>
+  </action>
  </widget>
  <resources>
   <include location="../ldforge.qrc"/>