[gnome-shell] switcherPopup: Fix spacing calculation for empty lists

[Florian Müllner <fmuellner src gnome org>]

commit 427790f005f8094d9d9495786ed5ed5ff2114689
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Jan 17 09:54:14 2014 -0500

    switcherPopup: Fix spacing calculation for empty lists
    
    Without special-casing, our current spacing calculation results in
    negative size requests for empty lists, which will trigger a Clutter
    assert later.
    While the list is never supposed to be empty, bugs happen; crashing
    users' systems is the least graceful way of handling this, so don't
    do it.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=722434

 js/ui/switcherPopup.js |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/switcherPopup.js b/js/ui/switcherPopup.js
index 3b1532f..176bc6a 100644
--- a/js/ui/switcherPopup.js
+++ b/js/ui/switcherPopup.js
@@ -513,7 +513,7 @@ const SwitcherList = new Lang.Class({
     _getPreferredWidth: function (actor, forHeight, alloc) {
         let [maxChildMin, maxChildNat] = this._maxChildWidth(forHeight);
 
-        let totalSpacing = this._list.spacing * (this._items.length - 1);
+        let totalSpacing = Math.max(this._list.spacing * (this._items.length - 1), 0);
         alloc.min_size = this._items.length * maxChildMin + totalSpacing;
         alloc.natural_size = alloc.min_size;
         this._minSize = alloc.min_size;
@@ -543,7 +543,7 @@ const SwitcherList = new Lang.Class({
         let childHeight = box.y2 - box.y1;
 
         let [maxChildMin, maxChildNat] = this._maxChildWidth(childHeight);
-        let totalSpacing = this._list.spacing * (this._items.length - 1);
+        let totalSpacing = Math.max(this._list.spacing * (this._items.length - 1), 0);
 
         let childWidth = Math.floor(Math.max(0, box.x2 - box.x1 - totalSpacing) / this._items.length);