<p>Apologies for the delay in responding - the last few weeks have been super busy.</p>
<p>I tried building with these changes.  It's nice to see that all the build warnings are gone!</p>
<p>On my machine (running Ubuntu 19.04), without your changes lines in the TreeView are gray, not red.  With your changes, they are black.  I personally think the gray looks better - the black lines are too distracting.</p>
<p>What operating system / distribution are you running?  That could have an effect on the TreeView line colors.  If possible, I think it would be better to use a color from the underlying GTK theme rather than hard-coding black.</p>

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