logviz: feature request - don't highlight messages from source file already-filtered source file

Small feature request: when a single source file is selected in the source file list, all the raw events pertain to that source file.
In this case, I would like the raw events to not be highlighted when I mouse-over the respective source file since the highlighting doesn't add anything. In particular, the highlighting is confusing immediately after selecting that one source file; immediately after clicking, the mouse is naturally on the file name and the highlighting obscures the warning/error colors that I expect to see.