198324 2019-05-28 23:14:12 -0700 [GTK] Mouse wheel scroll doesn't update whole web view 2019-09-03 01:46:03 -0700 1 1 1 Unclassified WebKit WebKitGTK Other Unspecified Unspecified NEW P2 Normal --- 1 mcrha webkit-unassigned bugs-noreply cgarcia tpopela oldest_to_newest 1539902 0 370831 mcrha 2019-05-28 23:14:12 -0700 Created attachment 370831 test-wk2.c I updated to Fedora 30, which has webkit2gtk3-2.24.2-1.fc30.x86_64 (I tried with 2.24.1 too, with the same result), and scrolling the web view with a mouse wheel doesn't update whole web view, only like 50 pixels at the top, eventually at the bottom (depending whether scrolling up or down), and the centre of the web view keeps the previous content. When I resize the window it fixes itself, till the next web view content (height?) change. I do not know whether it's anything with the video drivers or whatever. I can reproduce it on my main machine, but not in a virtual machine, where both use the same packages. Attached is a test program, with which I can reproduce it in GNOME (both Wayland and on Xorg), Plasma and MATE. The first line of it contains a comment with a command to compile & run it. Here is a video demonstrating the issue: https://people.gnome.org/~mcrha/webview-scroll.webm What I did there: a) ran the test program b) moved mouse above the web view and used the wheel to scroll it up and down. The scrollbar position changes, but the content doesn't update properly c) resized the window and repeated the mouse wheel usage, the scrolling is updated properly now d) click the Reload button, which changes content twice, once for a one-line text, then back to the long text, which allows scrolling e) steps b) and c) are reproduced Interestingly, the step d)+e) doesn't do it every time in GNOME, but in Plasma and MATE I've been able to reproduce this d)+e) reliably. I also tried with WEBKIT_DISABLE_COMPOSITING_MODE=1, but it did not help. 1539906 1 mcrha 2019-05-28 23:40:53 -0700 A little update, I had been composing a message in Evolution and the scrolling breaks in the editor more often, making editing a nightmare. Reproduced in `MiniBrowser -e" too, by writing enough lines to have scrolling required, then moving through the mail with arrow up/down. 1539907 2 mcrha 2019-05-28 23:52:51 -0700 I tried to downgrade webkit2gtk3 on my machine and I've found out that webkit2gtk3-2.22.4-1.fc30 works properly, while webkit2gtk3-2.23.1-1.fc30 is broken. There's no other prebuilt package in koji between these versions: https://koji.fedoraproject.org/koji/packageinfo?packageID=26162 1540256 3 tpopela 2019-05-29 23:15:14 -0700 (In reply to Milan Crha from comment #2) > There's no other prebuilt package in koji between these versions: > https://koji.fedoraproject.org/koji/packageinfo?packageID=26162 Because there was no release between them. But this should be pretty easy to bisect as you have a reproducer. I might look into it. 1540258 4 tpopela 2019-05-29 23:22:46 -0700 (In reply to Tomas Popela from comment #3) > I might look into it. I might not as the test case doesn't work for me (I don't have any problems). When you will come to the office, you can use the icecc to bisect it. 1555033 5 cgarcia 2019-07-23 05:23:38 -0700 Is this still happening? 1557539 6 mcrha 2019-07-31 22:55:07 -0700 (In reply to Carlos Garcia Campos from comment #5) > Is this still happening? I can give it a try. Which version this 'still' references, please? 1557545 7 cgarcia 2019-08-01 00:12:31 -0700 Thanks, current trunk would be ideal, but 2.25.3 should be enough I guess. 1557641 8 mcrha 2019-08-01 10:25:52 -0700 Right, stupid question, I'm sorry. I tried with git master at commit 82faa8a6360e54c75bc74f21287416cf7cefa44f, which references: git-svn-id: http://svn.webkit.org/repository/webkit/trunk@248099 268f45cc-cd09-0410-ab3c-d52691b4dbfc and I can still reproduce it. 1567159 9 mcrha 2019-09-02 02:17:30 -0700 This is still there when at git commit aec39837fb5478153424253f0a1871c5f2b2d7aa, aka git-svn-id: http://svn.webkit.org/repository/webkit/trunk@249376 268f45cc-cd09-0410-ab3c-d52691b4dbfc 1567303 10 mcrha 2019-09-03 01:46:03 -0700 One more observation, trying with webkit2gtk3-2.25.4-1.fc31.x86_64. It's easily reproducible with GNOME on Xorg and then the test program is called as: $ GDK_SYNCHRONIZE=1 ./test-wk2 Without that GDK_SYNCHRONIZE exported the painting after mouse wheel scroll works fine. I wasn't able to reproduce this with gnome-shell 3.33.91-1.fc32 and gtk3-3.24.10-2.fc31 under Wayland, but it was easy using the X session. Just run the test program and use the mouse wheel to scroll it up and down. 370831 2019-05-28 23:14:12 -0700 2019-05-28 23:14:12 -0700 test-wk2.c test-wk2.c text/x-csrc 7750 mcrha LyogZ2NjIGBwa2ctY29uZmlnIC0tY2ZsYWdzIC0tbGlicyBndGsrLTMuMCB3ZWJraXQyZ3RrLTQu MGAgdGVzdC13azIuYyAtZyAtTzAgLW8gdGVzdC13azIgJiYgLi90ZXN0LXdrMiAqLwoKI2luY2x1 ZGUgPHN0ZGlvLmg+CiNpbmNsdWRlIDxzdGRsaWIuaD4KI2luY2x1ZGUgPHN0cmluZy5oPgojaW5j bHVkZSA8Z3RrL2d0ay5oPgojaW5jbHVkZSA8d2Via2l0Mi93ZWJraXQyLmg+CgpzdGF0aWMgR1Rp bWVyICp0aW1lciA9IE5VTEw7CgpzdGF0aWMgdm9pZApyZWFkeV90b19zaG93X2NiIChXZWJLaXRX ZWJWaWV3ICp3ZWJfdmlldywKCQkgIGdwb2ludGVyIHVzZXJfZGF0YSkKewoJcHJpbnRmICgiJXM6 IGFmdGVyICVnc1xuIiwgX19GVU5DVElPTl9fLCBnX3RpbWVyX2VsYXBzZWQgKHRpbWVyLCBOVUxM KSk7Cn0KCnN0YXRpYyB2b2lkCmxvYWRfY2hhbmdlZF9jYiAoV2ViS2l0V2ViVmlldyAqd2ViX3Zp ZXcsCgkJIFdlYktpdExvYWRFdmVudCBsb2FkX2V2ZW50LAoJCSBncG9pbnRlciB1c2VyX2RhdGEp CnsKCXByaW50ZiAoIiVzOiAlcyBhZnRlciAlZ3NcbiIsIF9fRlVOQ1RJT05fXywKCQlsb2FkX2V2 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