My issues with lxpanel on gtk3

[pitsi]

Preface: The following is an almost an exact copy (images too) of what I said 1+ year ago at a project named lxde-continued, which had patched lxpanel for some of the issues it had when built with gtk3. On my end, lxpanel reached debian unstable on September 2023, a few weeks after the release of debian 12 as stable, and it was on 0.10.1 as before, but rebuilt with gtk3.
And from all the issues it had with gtk3, that fork only solved two: the one with the tooltips and the one with the geometry (panel expanding beyond the screen's borders), which tbh was the most annoying one.

So, since the geometry issue was solved in 0.11 and the tooltips issue is a known and unsolved one, here are the ones that I have spotted and I have not found similar reports for them.

App icons 1 of 2: As you can see below, sometimes the panel renders the apps' icons completely blank

and sometimes it renders them properly. This is usually fixed after a restart of the panel and is a known issue.

App icons 2 of 2: Moreover, when the icons are drawn properly, they are cropped at their top and bottom as you can see here.

Theming: For some reason, the panel prefers the "light" version of the gtk3 theme. I use numix as my gtk theme since ages and the panel, at its gtk2 era, had that dark color its menu has. Just to be sure it is not a gtk3 issue, I tried xfce4-panel (pictured is v4.18.4, stock configuration, just moved it at the bottom), which is definitely built against gtk3, and it is dark indeed.

My panel layout is very simple: menu + seperator + task bar + tray + digital clock + application launch bar (the single icon on the far right). And all of these issues are related to the gtk3 transition. It had no issues on gtk2.

Debian unstable x64, lxpanel 0.11.1 and gtk 3.24.49.t Before testing again for 0.11.x, I deleted the entire ~/.config/lxpanel/ folder so as to get the default configuration and avoid any old settings that would create a misconfiguration mess.