[gnome-tetravex] Add Ctrl-P shortcut for pausing.

[Arnaud B. <arnaudb src gnome org>]

commit cc3bce3d162f2027c4ee42d4fc566f0c8afea8a9
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Tue Sep 17 01:15:00 2019 +0200

    Add Ctrl-P shortcut for pausing.
    
    I think my keyboard does
    not have a Pause button.

 src/gnome-tetravex.vala | 18 ++++++++++--------
 src/help-overlay.ui     |  2 +-
 2 files changed, 11 insertions(+), 9 deletions(-)
---
diff --git a/src/gnome-tetravex.vala b/src/gnome-tetravex.vala
index 8efe229..b9657e8 100644
--- a/src/gnome-tetravex.vala
+++ b/src/gnome-tetravex.vala
@@ -88,14 +88,16 @@ private class Tetravex : Gtk.Application
         Window.set_default_icon_name ("org.gnome.Tetravex");
 
         add_action_entries (action_entries, this);
-        set_accels_for_action ("app.new-game", {"<Primary>n"});
-        set_accels_for_action ("app.pause", {"Pause"});
-        set_accels_for_action ("app.help", {"F1"});
-        set_accels_for_action ("app.quit", {"<Primary>q", "<Primary>w"});
-        set_accels_for_action ("app.move-up", {"<Primary>Up"});
-        set_accels_for_action ("app.move-down", {"<Primary>Down"});
-        set_accels_for_action ("app.move-left", {"<Primary>Left"});
-        set_accels_for_action ("app.move-right", {"<Primary>Right"});
+        set_accels_for_action ("app.new-game",      {"<Primary>n"       });
+        set_accels_for_action ("app.pause",         {"<Primary>p",
+                                                              "Pause"   });
+        set_accels_for_action ("app.help",          {         "F1"      });
+        set_accels_for_action ("app.quit",          {"<Primary>q",
+                                                     "<Primary>w"       });
+        set_accels_for_action ("app.move-up",       {"<Primary>Up"      });
+        set_accels_for_action ("app.move-down",     {"<Primary>Down"    });
+        set_accels_for_action ("app.move-left",     {"<Primary>Left"    });
+        set_accels_for_action ("app.move-right",    {"<Primary>Right"   });
 
         Builder builder = new Builder.from_resource ("/org/gnome/Tetravex/gnome-tetravex.ui");
 
diff --git a/src/help-overlay.ui b/src/help-overlay.ui
index a7186fe..ab7faf9 100644
--- a/src/help-overlay.ui
+++ b/src/help-overlay.ui
@@ -19,7 +19,7 @@
             <child>
               <object class="GtkShortcutsShortcut">
                 <property name="visible">1</property>
-                <property name="accelerator">Pause</property>
+                <property name="accelerator">&lt;Ctrl&gt;P Pause</property>
                 <property name="title" translatable="yes" context="shortcut window">Pause the game</property>
               </object>
             </child>