[gnome-shell] windowManager: Add bottom edge drag gesture to show OSK

[Florian Müllner <fmuellner src gnome org>]

commit 3a6b41495a1e0a4d9347f3b2f72b032f8cb87a00
Author: Jan-Michael Brummer <jan brummer tabos org>
Date:   Sun Feb 26 23:48:25 2017 +0100

    windowManager: Add bottom edge drag gesture to show OSK
    
    Adding a way to manually activate the OSK, in cases where it does not pop up
    automatically or has been closed by the user.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=757712

 js/ui/windowManager.js |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/windowManager.js b/js/ui/windowManager.js
index 3d0de97..43871fb 100644
--- a/js/ui/windowManager.js
+++ b/js/ui/windowManager.js
@@ -18,6 +18,7 @@ const ModalDialog = imports.ui.modalDialog;
 const Tweener = imports.ui.tweener;
 const WindowMenu = imports.ui.windowMenu;
 const PadOsd = imports.ui.padOsd;
+const EdgeDragAction = imports.ui.edgeDragAction;
 
 const SHELL_KEYBINDINGS_SCHEMA = 'org.gnome.shell.keybindings';
 const MINIMIZE_WINDOW_ANIMATION_TIME = 0.2;
@@ -996,6 +997,12 @@ const WindowManager = new Lang.Class({
         gesture = new AppSwitchAction();
         gesture.connect('activated', Lang.bind(this, this._switchApp));
         global.stage.add_action(gesture);
+
+        gesture = new EdgeDragAction.EdgeDragAction(St.Side.BOTTOM, Shell.ActionMode.ALL);
+        gesture.connect('activated', Lang.bind(this, function() {
+            Main.keyboard.show(Main.layoutManager.bottomIndex);
+        }));
+        global.stage.add_action(gesture);
     },
 
     _showPadOsd: function (display, device, settings, imagePath, editionMode, monitorIndex) {