overview: Use monotonic time to check for consecutive activationswip/fmuellner/delorian-overview

We don't toggle the overview if the request happens too close to the
last activation, to filter out double-clicks or activation by both
the hot corner and a click. However as the check is based on the
real time, the check breaks if the system clock moves backwards and
the last activations appears to be in the future. Fix this by using
monotonic time which is guaranteed to only move forward.

https://bugzilla.gnome.org/show_bug.cgi?id=763886

1 files changed, 3 insertions, 2 deletions

diff --git a/js/ui/overview.js b/js/ui/overview.js
index 3d8d76b57..224057640 100644
--- a/js/ui/overview.js
+++ b/js/ui/overview.js
@@ -488,7 +488,8 @@ var Overview = new Lang.Class({
             return false;
         if (this._inItemDrag || this._inWindowDrag)
             return false;
-        if (this._activationTime == 0 || Date.now() / 1000 - this._activationTime > OVERVIEW_ACTIVATION_TIMEOUT)
+        if (this._activationTime == 0 ||
+            GLib.get_monotonic_time() / GLib.USEC_PER_SEC - this._activationTime > OVERVIEW_ACTIVATION_TIMEOUT)
             return true;
         return false;
     },
@@ -547,7 +548,7 @@ var Overview = new Lang.Class({
         this.visible = true;
         this.animationInProgress = true;
         this.visibleTarget = true;
-        this._activationTime = Date.now() / 1000;
+        this._activationTime = GLib.get_monotonic_time() / GLib.USEC_PER_SEC;
 
         Meta.disable_unredirect_for_screen(global.screen);
         this.viewSelector.show();