Vcs: fix missing icons in SubmitFileModel

In SubmitFileModel, filetype icons are missing for not "overlaid" icons in
Core::FileIconProvider. This is fixed by ensuring valid file paths are passed
to QFileInfo. VcsBase::SubmitFileModel has now a "repositoryRoot" property
so it can constructs absolute file paths.

VcsBaseSubmitEditor::setFileModel() now relies on SubmitFileModel::repositoryRoot()
instead of passing this info as annex parameter.

Change-Id: Ie045c3a7b247a5b5d48d10aaaf67cb3fdcf9fa7e
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/vcsbase/submitfilemodel.h

@@ -50,6 +50,9 @@ class VCSBASE_EXPORT SubmitFileModel : public QStandardItemModel
 public:
     explicit SubmitFileModel(QObject *parent = 0);
 
+    const QString &repositoryRoot() const;
+    void setRepositoryRoot(const QString &repoRoot);
+
     // Convenience to create and add rows containing a file plus status text.
     QList<QStandardItem *> addFile(const QString &fileName, const QString &status = QString(),
                                    CheckMode checkMode = Checked, const QVariant &data = QVariant());
@@ -69,6 +72,9 @@ public:
     unsigned int filterFiles(const QStringList &filter);
 
     virtual void updateSelections(SubmitFileModel *source);
+
+private:
+    QString m_repositoryRoot;
 };
 
 } // namespace VcsBase