[totem] data: Add frame stepping shortcuts to the list

[Bastien Nocera <hadess src gnome org>]

commit 1f50b0c42d3b60ec974f610361fb1c5932f4c83d
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Jul 26 14:03:03 2018 +0200

    data: Add frame stepping shortcuts to the list
    
    Closes: #253

 data/shortcuts.ui | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/data/shortcuts.ui b/data/shortcuts.ui
index f09d60d8..609eeb52 100644
--- a/data/shortcuts.ui
+++ b/data/shortcuts.ui
@@ -178,6 +178,20 @@
                 <property name="title" translatable="yes" context="shortcut window">Go forward 60 
seconds</property>
               </object>
             </child>
+            <child>
+              <object class="GtkShortcutsShortcut" id="step-back">
+                <property name="visible">1</property>
+                <property name="accelerator">comma</property>
+                <property name="title" translatable="yes" context="shortcut window">Step back one 
frame</property>
+              </object>
+            </child>
+            <child>
+              <object class="GtkShortcutsShortcut" id="step-forward">
+                <property name="visible">1</property>
+                <property name="accelerator">period</property>
+                <property name="title" translatable="yes" context="shortcut window">Step forward one 
frame</property>
+              </object>
+            </child>
             <child>
               <object class="GtkShortcutsShortcut" id="go-back-5">
                 <property name="visible">1</property>