Nightly 59 x64 20171206221407 de_DE @ Debian Testing (KDE, Radeon RX480) fresh profile STR 1. open https://www.mozilla.org/en-US/firefox/nightly/firstrun/ 2. then open https://bugzilla.mozilla.org in the same tab 3. do a rightclick. (If I hold down the right mouse button the context menu won't immediately disappear and run some action.) mozregression --good 2017-12-05 --bad 2017-12-06 > 5:02.34 INFO: Last good revision: a27e933a27b65f220dabf6a5949ce15003485fd6 > 5:02.34 INFO: First bad revision: ed817bc6cc3bc2a11e9607afb3c5b52702ceb12a > 5:02.34 INFO: Pushlog: > https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=a27e933a27b65f220dabf6a5949ce15003485fd6&tochange=ed817bc6cc3bc2a11e9607afb3c5b52702ceb12a > ed817bc6cc3b Martin Stransky — Bug 1421974 - use gtk_window_set_titlebar() to hide titlebar on WM where GDK_DECOR_BORDER does not work, r=jhorak > 663151801680 Martin Stransky — Bug 1421974 - refactor nsWindow::HideWindowChrome() to nsWindow::SetWindowDecoration() and share it with nsWindow::SetDrawsInTitlebar, r=jhorak

Thanks, I'll look at it.

We hit a bug when mContainer has a different origin than mShell - that's when CSD is active or the CSD titlebar mode is enabled.

Bug 1423869 should partially fix that for gnome-shell and Cinamon. Other systems can use a workaround and run "$MOZ_GTK_TITLEBAR_DECORATION=none ./firefox" when patches from Bug 1423869 lands.

I don't have the fix now as it's more complicated than I expected. Let's disable CSD decorations to fix the regression. This workaround needs patch from Bug 1423869.

Should we be backing out the work from bug 1421974, in the meantime? Is that the cause (as suggested in bug 1424110)?

Comment on attachment 8936303 [details] Bug 1423810 - Temporary disable CSD decoration as it breaks popup windows, https://reviewboard.mozilla.org/r/207036/#review212926

(In reply to Liz Henry (:lizzard) (needinfo? me) from comment #8) > Should we be backing out the work from bug 1421974, in the meantime? Is > that the cause (as suggested in bug 1424110)? Yes, bug 1421974 causes this regression but we can disable only the broken part, which does the patch here.

Pushed by stransky@redhat.com: https://hg.mozilla.org/integration/autoland/rev/114cd5adf270 Temporary disable CSD decoration as it breaks popup windows, r=jhorak

Follow up bug for full fix Bug 1424974.

Now that the full fix is finished, shouldn't CSD be turned back on?