clicking on line number erases parameters

[vladak]

When a line number is clicked in a file whose particular revision displayed (i.e. the URL is in the form of http://localhost:8080/source/xref/mercurial/main.c?r=12%3Aec47d2e13931 - with the r parameter), the parameter disappears (i.e. the URL becomes http://localhost:8080/source/xref/mercurial/main.c#44 if line 44 is clicked on - the expected behavior is that the URL becomes http://localhost:8080/source/xref/mercurial/main.c?r=12%3Aec47d2e13931#44).

This blocks the fix for #1736.

[vladak]

For completeness, this happens in FF 52.2.0.