VCS: Fix diff viewer for paths with spaces

Task-number: QTCREATORBUG-8330
Change-Id: I25c8f7172f38716ab625705c4969a7685d373e4e
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/vcsbase/vcsbaseeditor.cpp

@@ -1382,6 +1382,12 @@ QString VcsBaseEditorWidget::findDiffFile(const QString &f) const
     if (in.isFile())
         return in.absoluteFilePath();
 
+    // 4) remove trailing tab char and try again: At least git appends \t when the
+    //    filename contains spaces. Since the diff commend does use \t all of a sudden,
+    //    too, when seeing spaces in a filename, I expect the same behavior in other VCS.
+    if (f.endsWith(QLatin1Char('\t')))
+        return findDiffFile(f.left(f.length() - 1));
+
     return QString();
 }