[gnome-shell/T27795: 108/138] iconGrid: Don't compute any space between pages when there's only one page

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 70e727e7fa8a4421a231a9e5bf10b11262d03bb9
Author: Mario Sanchez Prada <mario endlessm com>
Date:   Sat Jun 17 00:01:13 2017 +0100

    iconGrid: Don't compute any space between pages when there's only one page
    
    Use the default spacing between icons, which will give enough room for the
    popups to render properly while not breaking the rest of the computations
    that already accounted for that. This will prevent some extra vertical
    allocation that we don't really need, allowing us to reuse it to have a
    less congested desktop.
    
    https://phabricator.endlessm.com/T17658

 js/ui/iconGrid.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/js/ui/iconGrid.js b/js/ui/iconGrid.js
index 04a2b011b1..ed5dd1eb91 100644
--- a/js/ui/iconGrid.js
+++ b/js/ui/iconGrid.js
@@ -791,7 +791,12 @@ var PaginatedIconGrid = GObject.registerClass({
         // We want to contain the grid inside the parent box with padding
         this._rowsPerPage = this.rowsForHeight(availHeightPerPage);
         this._nPages = Math.ceil(nRows / this._rowsPerPage);
-        this._spaceBetweenPages = availHeightPerPage - (this.topPadding + this.bottomPadding) - 
this._availableHeightPerPageForItems();
+
+        if (this._nPages > 1)
+            this._spaceBetweenPages = availHeightPerPage - (this.topPadding + this.bottomPadding) - 
this._availableHeightPerPageForItems();
+        else
+            this._spaceBetweenPages = this._getSpacing();
+
         this._childrenPerPage = nColumns * this._rowsPerPage;
     }