Created attachment 8228 annoying white border with tab bar visible I get a single-pixel thick white border around the terminal text window when I open multiple tabs and the tab bar becomes visible. It's especially annoying in the left and bottom edges where the (black) text area is adjacent to the (black) panel and the (black) monitor edge. I have seen this issue mentioned many times, with bugs going as far back as 2007, but the cause in those cases seems to be the theme. This happens to me regardless of the theme I use.
In particular, I have the Default, Arc, Daloa, Greybird, Kokodi, Moheli, Pocillo and TUXEDO themes available to me (as well as some variations). I will check to see if any CSS is common to all of them. (I'm not very familiar with GTK's workings)
In fact, this still seems to be a theme issue - for example, I don't see the extra pixel under Adwaita. Do you? I've found a gnome-terminal bug (https://bugzilla.gnome.org/show_bug.cgi?id=356576) where they said it had been worked around in Adwaita around 2012. I wasn't able to find the exact commit that fixed the issue, however. I've update an old Greybird issue about the same that has supposedly been fixed once but it may have broken since then: https://github.com/shimmerproject/Greybird/issues/184
Created attachment 8254 Two apparent ways to select a theme in Ubuntu Budgie/XFCE Hmm, it looks like I have been using the wrong method to choose a theme ("Window Manager"). Using "Appearance", it does indeed seem that the bug is specific to Greybird. I am sorry, it gets confusing with all these different DEs, GTK versions, CSS themes and tweaks. Had I known, I would have simply updated one of the Greybird issues I stumbled across on my way here.
That's fine, no worries! I'm closing the bug since it's a Greybird theme issue - please see the github record.
*** Bug 3244 has been marked as a duplicate of this bug. ***