[gnome-shell] Workaround being allocated 0x0

[Colin Walters <walters src gnome org>]

commit d120d03de9b758366c3ae3e040b765f26a12f6e8
Author: Colin Walters <walters verbum org>
Date:   Tue Oct 6 14:07:40 2009 -0400

    Workaround being allocated 0x0
    
    Because of a chain of bugs we could end up getting allocated 0x0,
    and this would cause the WellGrid allocation code to be unhappy.
    
    See http://bugzilla.openedhand.com/show_bug.cgi?id=1831
    
    Simply treat 0 as "unlimited" i.e. equivalent to -1.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=597586

 js/ui/appDisplay.js |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/appDisplay.js b/js/ui/appDisplay.js
index 3e9a3bd..85b6ee6 100644
--- a/js/ui/appDisplay.js
+++ b/js/ui/appDisplay.js
@@ -695,7 +695,10 @@ WellGrid.prototype = {
             return [0, WELL_DEFAULT_COLUMNS, 0, 0];
         let nColumns = 0;
         let usedWidth = 0;
-        if (forWidth < 0) {
+        // Big.Box will allocate us at 0x0 if we are not visible; this is probably a
+        // Big.Box bug but it can't be fixed because if children are skipped in allocate()
+        // Clutter gets confused (see http://bugzilla.openedhand.com/show_bug.cgi?id=1831)
+        if (forWidth <= 0) {
             nColumns = WELL_DEFAULT_COLUMNS;
         } else {
             while (nColumns < WELL_DEFAULT_COLUMNS &&
@@ -720,7 +723,7 @@ WellGrid.prototype = {
         let rows = Math.ceil(children.length / nColumns);
 
         let itemWidth;
-        if (forWidth < 0) {
+        if (forWidth <= 0) {
             itemWidth = itemNaturalWidth;
         } else {
             itemWidth = Math.floor(forWidth / nColumns);