leading space in manual path specification is interpreted as current directory

[Karl-Philipp Richter]

* Impact:
Leading space in locations lead to error

* Test case
- enter ' /usr/share/' as a location in the top bar, it should opening the directory and not error out

* Regression potential
the code change is around the text parsing done in the location bar, enter a few different locations and check those work as expected

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For example, if one enters ` /path/to/directory` the input (including the leading space) resolves to `/path/to/current/directory /path/to/directory` which is never a valid input. The leading space should thus be removed before changing the directory.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: nautilus 1:3.14.2-0ubuntu8
ProcVersionSignature: Ubuntu 3.19.0-11.11-generic 3.19.3
Uname: Linux 3.19.0-11-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Apr 4 01:21:29 2015
EcryptfsInUse: Yes
GsettingsChanges: b'org.gnome.nautilus.list-view' b'default-column-order' b"['name', 'size', 'type', 'date_modified', 'date_accessed', 'owner', 'group', 'permissions', 'mime_type', 'where']"
InstallationDate: Installed on 2015-04-02 (1 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/GNOME. If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status. Thanks in advance.

[Sebastien Bacher (seb128)]

There is also a gtk feature request upstream on https://gitlab.gnome.org/GNOME/gtk/issues/6

[Sebastien Bacher (seb128)]

The current version doesn't interpret it the same way but just display an error, gtk upstream said they would take a patch to stip the spaces though