[gnome-shell/T27795: 107/138] appDisplay: Enable or disable panning depending on the number of pages

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

commit 1c2576cf35427b6fecc8d47e92cb2a0998d27024
Author: Mario Sanchez Prada <mario endlessm com>
Date:   Fri Jun 16 23:57:02 2017 +0100

    appDisplay: Enable or disable panning depending on the number of pages
    
    We don't want to allow the user to move the icon grid up/down when
    there's no other page to move to, so disable/enable this feature
    depending on the number of pages.
    
    https://phabricator.endlessm.com/T17658

 js/ui/appDisplay.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/js/ui/appDisplay.js b/js/ui/appDisplay.js
index 277ccaf649..70076bf43d 100644
--- a/js/ui/appDisplay.js
+++ b/js/ui/appDisplay.js
@@ -374,8 +374,8 @@ var AllView = class AllView extends BaseAppView {
         panAction.connect('gesture-cancel', this._onPanEnd.bind(this));
         panAction.connect('gesture-end', this._onPanEnd.bind(this));
         this._panAction = panAction;
-        this._scrollView.add_action(panAction);
         this._panning = false;
+
         this._clickAction = new Clutter.ClickAction();
         this._clickAction.connect('clicked', () => {
             if (!this._currentPopup)
@@ -762,6 +762,11 @@ var AllView = class AllView extends BaseAppView {
         // Update folder views
         for (let i = 0; i < this.folderIcons.length; i++)
             this.folderIcons[i].adaptToSize(availWidth, availHeight);
+
+        // Enable panning depending on the number of pages
+        this._scrollView.remove_action(this._panAction);
+        if (this._grid.nPages() > 1)
+            this._scrollView.add_action(this._panAction);
     }
 
     _handleDragOvershoot(dragEvent) {