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Created attachment 8802041 [details] image-preview-on-other-window.gif Regression from Bug 1301342. Now that the XUL panel used by the HTMLTooltips has the "noautohide" attribute set to true, the tooltips are no longer hidden when the window loses focus (see attached GIF) This is only an issue for tooltips using a XULPanelWrapper because the other tooltips are constrained to the devtools document and can't be displayed outside of the devtools' window. We should try an alternative solution for 1301342 and reuse the fact that XUL panels get automatically hidden rather than preventing it. For instance we could listen for the "hidden" event of the panel, and programmatically hide the corresponding HTMLTooltip when we receive it.
Implemented the approach described in the summary. Try https://treeherder.mozilla.org/#/jobs?repo=try&revision=d98e767c662805160a39652ccfca2096cd6f3d57
Try is green except for unrelated taskcluster issues. Asking for review!
Comment on attachment 8802326 [details] Bug 1310957 - listen to XUL Panel wrapper hidden event to hide HTML tooltip; https://reviewboard.mozilla.org/r/86742/#review85966
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/autoland/rev/9ee4fd380512 listen to XUL Panel wrapper hidden event to hide HTML tooltip;r=gl
I have reproduced this bug with Nightly 52.0a1 (2016-10-18) (64-bit) on Windows 7, 64 Bit ! This bug's fix is verified with latest Nightly Build ID 20161028030204 User Agent Mozilla/5.0(Windows NT 6.1; Win64; x64; rv:52.0) Gecko/20100101 Firefox/52.0
Thanks for verifying using Windows :mMARUF! Also confirmed verified fixed under Mac OS X 10.11 with latest Nightly 52.0a1, so I'm updating it's resolution.