Dash appears instead of Spread when Super+W is tapped faster than dash_tap_duration

The bug:
When Super+W is pressed quickly, the Dash appears instead of the Spread. The fact that W has also been pressed is ignored. “Quickly” means the duration less than the dash_tap_duration parameter which is found in Launcher tab of the CompizConfig Settings Manager as the “Dash tap duration”.

Steps to reproduce:
– open CompizConfig Settings Manager
– in Launcher tab, change the parameter “Dash tap duration” to some high value, say 1000 milliseconds (more is prohibited)
– press Super+W within the duration not more than one second
– WHAT IS EXPECTED: Spread mode should appear
– WHAT HAPPENS INSTEAD: Dash appears

Obviously, this bug can also be reproduced with the default value of dash_tap_duration (250ms) but with the higher value it's more evident and easier to reproduce.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.1.2+14.04.20140220-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-11.31-generic 3.13.3
Uname: Linux 3.13.0-11-generic x86_64
ApportVersion: 2.13.2-0ubuntu5
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CurrentDesktop: Unity
Date: Sun Feb 23 15:57:16 2014
InstallationDate: Installed on 2014-01-27 (26 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140124)
ProcEnviron:
 LANGUAGE=ru
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)