[simple-scan] app-window.ui: Add new shortcut

[Bartosz <bkosiorek src gnome org>]

commit b9ff456815700b9fcbc988eb01c74c975314b30a
Author: Sabri Ünal <libreajans gmail com>
Date:   Fri Mar 6 21:50:37 2020 +0300

    app-window.ui: Add new shortcut
    
    Add new shortcut: f10: Open menu and list it in the Keyboard Shortcuts dialog

 src/app-window.ui   | 1 +
 src/help-overlay.ui | 7 +++++++
 2 files changed, 8 insertions(+)
---
diff --git a/src/app-window.ui b/src/app-window.ui
index e0e16c0..6f42a51 100644
--- a/src/app-window.ui
+++ b/src/app-window.ui
@@ -670,6 +670,7 @@
             <property name="can_focus">False</property>
             <property name="receives_default">False</property>
             <property name="use_underline">True</property>
+            <accelerator key="F10" signal="activate"/>
             <child>
               <object class="GtkImage">
                 <property name="visible">True</property>
diff --git a/src/help-overlay.ui b/src/help-overlay.ui
index b1a0127..7a77bfd 100644
--- a/src/help-overlay.ui
+++ b/src/help-overlay.ui
@@ -133,6 +133,13 @@
                 <property name="title" translatable="yes" context="shortcut window">Show help</property>
               </object>
             </child>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">1</property>
+                <property name="accelerator">F10</property>
+                <property name="title" translatable="yes" context="shortcut window">Open menu</property>
+              </object>
+            </child>
             <child>
               <object class="GtkShortcutsShortcut">
                 <property name="visible">1</property>