[REG 6.6] linguist freezes when trying to display .ui files

When opening a .ts file which contains a message with the location inside a .ui file, the linguist freezes and needs to be force closed. There's no problem with locations pointing to source files (.cpp, .h, etc.), only with .ui files. My assumption is that loading the forms viewer in the "Sources and Forms" dock widget is buggy.

Example .ts file:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE TS>
<TS version="2.1" language="de_DE">
<context>
<name>MainWindow</name>
<message>
<location filename="mainwindow.ui" line="14"/>
<source>Qt Test</source>
<translation type="unfinished"></translation>
</message>
</context>
</TS>