It looks like the bug is in QtBase: in the XCB plugin, the handleConfigureNotifyEvent() method initially wants to find out what is the new screen for the window, but due to a bug, it gets a NULL screen and decides to return from the function without processing the size changes. The reason for the failure (that is, the reason why we get NULL as a screen) is that the parentScreen() method doesn't take foreign windows into account: when we are embedding windows with the XEMBED protocol, the parent window is the embedder, which might live in another process; Qt does not know anything about this window other than its numeric ID, meaning that it doesn't know its screen either.
Therefore, we need to special-case these windows, and make sure that parentScreen() returns a sensible value. Note that the patch doesn't need upstreaming: the Qt 5.6 code is already quite different (it doesn't even call the parentScreen() method here) and might be already fine. I'll test it with a local build, and report a bug to the Qt bugtracker in case. ** Patch added: "Patch for qtbase" https://bugs.launchpad.net/webapps-sprint/+bug/1564767/+attachment/4622777/+files/xcb_fix_parent_screen_of_embedded_windows.patch ** Also affects: qtbase-opensource-src (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center-signon in Ubuntu. https://bugs.launchpad.net/bugs/1564767 Title: Wrong size of embedded window Status in webapps-sprint: In Progress Status in gnome-control-center-signon package in Ubuntu: New Status in qtbase-opensource-src package in Ubuntu: New Bug description: When creating an online account in Xenial, the embedded webview is not properly resized to fill up the embedder's area (see attached screenshot). I'll investigate to find out whether this is a problem with the window manager, or with the XEMBED implementation in Gdk or Qt; but meanwhile, I'll try to apply a workaround in unity-control-center- signon. To manage notifications about this bug go to: https://bugs.launchpad.net/webapps-sprint/+bug/1564767/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
