[evince] shell: Add 'toggle continuous' shortcut to help overlay

[Germán Poo-Caamaño <gpoo src gnome org>]

commit cf88ef271a60253d8928769c7ff02b163fc5daa5
Author: Oisín <denpashogai gmail com>
Date:   Thu Jun 28 11:03:35 2018 -0400

    shell: Add 'toggle continuous' shortcut to help overlay
    
    * Add 'c' shortcut for continuos scrolling
    
    Fix the remaining shortcut filed in issue #820.
    
    Closes #820

 shell/help-overlay.ui | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/shell/help-overlay.ui b/shell/help-overlay.ui
index fc3c0e16..7e4e70cd 100644
--- a/shell/help-overlay.ui
+++ b/shell/help-overlay.ui
@@ -277,6 +277,13 @@
                 <property name="accelerator">&lt;Primary&gt;I</property>
               </object>
             </child>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">True</property>
+                <property name="title" translatable="yes" context="shortcut window">Toggle continuous 
scrolling</property>
+                <property name="accelerator">c</property>
+              </object>
+            </child>
             <child>
               <object class="GtkShortcutsShortcut">
                 <property name="visible">True</property>