Keyboard layout switching doesn't work in Unity Spread Filter

[Alexey Kulik]

The newly implemented feature of window filtering in Unity Spread is great! Thanks to developers!
At the moment, there is no possibility to switch the keyboard layout inside the Spread.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.1.2+14.04.20140218.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-10.30-generic 3.13.3
Uname: Linux 3.13.0-10-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: Wed Feb 19 20:18:48 2014
InstallationDate: Installed on 2014-01-27 (23 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)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Alberto Salvia Novella (es20490446e)]

It impacts accessibility of a core package.

[Rodrigo Lledó (rodhos-hp)]

As part of the big bug review for 16.04 LTS, I have tested this on 15.10 and the bug is still there.