In bug 1363361, I disabled browser_windowopen_reflows.js because of intermittent failure in the debug case, and perma-failure in the opt case. Clearly there's some kind of race going on here. We should figure this out and re-enable the test.

I did take a look this. It seems to me, as of today, the expected reflows for Linux is not correct. Since bug 1414252, we haven't observed the reflow caused by handleEvent@chrome://browser/content/tabbrowser.xml, we can drop it. Also after bug 1377447, we use EnsurePresShellInitAndFrames for focus handling, so in theory, we should not observe a reflow caused by focusAndSelectUrlBar@chrome://browser/content/browser.js. I don't quite understand why other platforms still observe the reflow though. A try, looks good so far. https://treeherder.mozilla.org/#/jobs?repo=try&revision=2e81e39c4443d2e39bb08f21ea150d85145a426b

Try for all platforms, looks really nice. https://treeherder.mozilla.org/#/jobs?repo=try&revision=f518b1b68f7dbfdfd7c58b95d4f34820e1dc4e34

Comment on attachment 8937631 [details] Bug 1380465 - Drop an expected reflow for Linux in browser_windowopen_reflows.js. https://reviewboard.mozilla.org/r/208308/#review214190 Thanks! ::: commit-message-7c457:1 (Diff revision 1) > +Bug 1380465 - Drop an expected reflow for Linux as well. r?mconley Nit: "as well" suggests that this is a continuation of something, but it's the first patch in a series. Perhaps let's have this be: "Bug 1380465 - Drop an expected reflow for Linux in browser_windowopen_reflows.js. r?mconley" ::: commit-message-7c457:3 (Diff revision 1) > +Bug 1380465 - Drop an expected reflow for Linux as well. r?mconley > + > +The reflow has suppressed by bug 1414252, and the expected reflow Nit: "has" -> "was"

Comment on attachment 8937632 [details] Bug 1380465 - Drop the expected reflows about focus on url bar. https://reviewboard.mozilla.org/r/208310/#review214196 Thanks!

Comment on attachment 8937633 [details] Bug 1380465 - Enable browser_windowopen_reflows.js on Linux. https://reviewboard.mozilla.org/r/208312/#review214198 I really appreciate you turning this back on, hiro!

(In reply to Mike Conley (:mconley) (:⚙️) - Backlogged on reviews and needinfos from comment #6) > Comment on attachment 8937631 [details] > Bug 1380465 - Drop an expected reflow for Linux in > browser_windowopen_reflows.js. > > https://reviewboard.mozilla.org/r/208308/#review214190 > > Thanks! > > ::: commit-message-7c457:1 > (Diff revision 1) > > +Bug 1380465 - Drop an expected reflow for Linux as well. r?mconley > > Nit: "as well" suggests that this is a continuation of something, but it's > the first patch in a series. That's really good to know for me. :) Thanks!

Pushed by hikezoe@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/e7e988f26a6d Drop an expected reflow for Linux in browser_windowopen_reflows.js. r=mconley https://hg.mozilla.org/integration/autoland/rev/5619db8e95f7 Drop the expected reflows about focus on url bar. r=mconley https://hg.mozilla.org/integration/autoland/rev/fc7d77434051 Enable browser_windowopen_reflows.js on Linux. r=mconley

https://hg.mozilla.org/mozilla-central/rev/e7e988f26a6d https://hg.mozilla.org/mozilla-central/rev/5619db8e95f7 https://hg.mozilla.org/mozilla-central/rev/fc7d77434051