Moving a tab by dragging it with the mouse causes the titlebar to lose active appearance. This is a regression caused by Bug 1442755 and does not happen with other applications like Nautilus, gedit and Chromium. This behavior might be expected when the tab is dragged outside the tab strip to create a new window but not when remaining inside the tab strip.
Martin you landed bug 1442755
This is not limited to tab dragging, all drag and drop operations are affected.
Summary: Titlebar loses active appearance when tab dragged inside tab strip → Titlebar loses active appearance during drag and drop operations
Kestrel, which system do you run? I can't reproduce that on Fedora 29/Gtk+ 3.24.
Flags: needinfo?(stransky) → needinfo?(ke5trel)
Ubuntu 18.04 is affected. Ubuntu 16.04 LTS is unaffected.
Okay, I'll try that.
Ubuntu 18.10 is unaffected (GTK+ 3.24.1). The affected Ubuntu 18.04.1 LTS uses GTK+ 3.22.30.
This seems to be a variant of Bug 1491808. I can reproduce that on Ubuntu 18.04. We may base our window inactive state on the backdrop property of toplevel window instead of the focus.
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/autoland/rev/c1715e7443b8 Check Gtk backdrop state flag to make Firefox toplevel window look inactive, r=jhorak
Is this something we should consider backporting to Beta? It grafts cleanly as-landed.
Let's consider that after some time at nightly.
I think we rather disable Bug 1442755 for Beta as it reveals more are regressions (Bug 1506050 recently).
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