[gnome-shell] screenshot: fix off-by-one selection size

[Jasper St. Pierre <jstpierre src gnome org>]

commit 6380526c12e35b6274e933639f89c3a171b74b12
Author: Clément Guérin <geecko dev free fr>
Date:   Sat Mar 14 23:48:41 2015 +0100

    screenshot: fix off-by-one selection size
    
    Selecting the whole screen made a (scr_w-1,scr_h-1) sized screenshot.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=746223

 js/ui/screenshot.js |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/screenshot.js b/js/ui/screenshot.js
index 50c5f9d..3a095b1 100644
--- a/js/ui/screenshot.js
+++ b/js/ui/screenshot.js
@@ -283,8 +283,8 @@ const SelectArea = new Lang.Class({
     _getGeometry: function() {
         return { x: Math.min(this._startX, this._lastX),
                  y: Math.min(this._startY, this._lastY),
-                 width: Math.abs(this._startX - this._lastX),
-                 height: Math.abs(this._startY - this._lastY) };
+                 width: Math.abs(this._startX - this._lastX) + 1,
+                 height: Math.abs(this._startY - this._lastY) + 1 };
     },
 
     _onMotionEvent: function(actor, event) {