225764 2021-05-13 06:33:44 -0700 [GTK] Wrong smooth animation sometimes with non-async scrolling 2021-05-13 22:52:55 -0700 1 1 1 Unclassified WebKit WebKitGTK WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED Gtk P2 Normal --- 1 cgarcia webkit-unassigned aperez bugs-noreply oldest_to_newest 1759675 0 cgarcia 2021-05-13 06:33:44 -0700 This is easy to reproduce with epiphany, opening the browser with a several of tabs. Then go tab by tab scrolling and some of them don't scroll properly, the smooth animation is wrong. This is happening because sometimes when the scrollbars are added to the scroll view, the contents size hasn't been updated yet, so that values saved by ScrollAnimationSmooth::updateVisibleLengths() are 0x0. After that the updateVisibleLengths() is not called again when the contents size is updated, so scroll happens with the wrong visible lengths. This doesn't happen with async scrolling because updateVisibleLengths() is called every time layers are repositioned. For non-async scrolling it should be enough to update visible lengths when he contents size changes. 1759676 1 428512 cgarcia 2021-05-13 06:36:12 -0700 Created attachment 428512 Patch 1760009 2 cgarcia 2021-05-13 22:52:55 -0700 Committed r277482 (237717@main): <https://commits.webkit.org/237717@main> 428512 2021-05-13 06:36:12 -0700 2021-05-13 07:16:43 -0700 Patch wcore-smooth-broken.diff text/plain 2538 cgarcia ZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZyBiL1NvdXJjZS9XZWJDb3JlL0No YW5nZUxvZwppbmRleCAzNGNlMDM4NWNjZDguLjM3YjQ2NjY0MWM0MSAxMDA2NDQKLS0tIGEvU291 cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAt MSwzICsxLDIyIEBACisyMDIxLTA1LTEzICBDYXJsb3MgR2FyY2lhIENhbXBvcyAgPGNnYXJjaWFA aWdhbGlhLmNvbT4KKworICAgICAgICBbR1RLXSBXcm9uZyBzbW9vdGggYW5pbWF0aW9uIHNvbWV0 aW1lcyB3aXRoIG5vbi1hc3luYyBzY3JvbGxpbmcKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtp dC5vcmcvc2hvd19idWcuY2dpP2lkPTIyNTc2NAorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9E WSAoT09QUyEpLgorCisgICAgICAgIFRoaXMgaXMgaGFwcGVuaW5nIGJlY2F1c2Ugc29tZXRpbWVz IHdoZW4gdGhlIHNjcm9sbGJhcnMgYXJlIGFkZGVkIHRvIHRoZSBzY3JvbGwgdmlldywgdGhlIGNv bnRlbnRzIHNpemUgaGFzbid0CisgICAgICAgIGJlZW4gdXBkYXRlZCB5ZXQsIHNvIHRoYXQgdmFs dWVzIHNhdmVkIGJ5IFNjcm9sbEFuaW1hdGlvblNtb290aDo6dXBkYXRlVmlzaWJsZUxlbmd0aHMo KSBhcmUgMHgwLiBBZnRlciB0aGF0IHRoZQorICAgICAgICB1cGRhdGVWaXNpYmxlTGVuZ3Rocygp IGlzIG5vdCBjYWxsZWQgYWdhaW4gd2hlbiB0aGUgY29udGVudHMgc2l6ZSBpcyB1cGRhdGVkLCBz byBzY3JvbGwgaGFwcGVucyB3aXRoIHRoZSB3cm9uZworICAgICAgICB2aXNpYmxlIGxlbmd0aHMu IFRoaXMgZG9lc24ndCBoYXBwZW4gd2l0aCBhc3luYyBzY3JvbGxpbmcgYmVjYXVzZSB1cGRhdGVW aXNpYmxlTGVuZ3RocygpICBpcyBjYWxsZWQgZXZlcnkgdGltZQorICAgICAgICBsYXllcnMgYXJl IHJlcG9zaXRpb25lZC4gRm9yIG5vbi1hc3luYyBzY3JvbGxpbmcgaXQgc2hvdWxkIGJlIGVub3Vn aCB0byB1cGRhdGUgdmlzaWJsZSBsZW5ndGhzIHdoZW4gaGUgY29udGVudHMKKyAgICAgICAgc2l6 ZSBjaGFuZ2VzLgorCisgICAgICAgICogcGxhdGZvcm0vU2Nyb2xsQW5pbWF0b3IuY3BwOgorICAg ICAgICAoV2ViQ29yZTo6U2Nyb2xsQW5pbWF0b3I6OmNvbnRlbnRzUmVzaXplZCBjb25zdCk6Cisg ICAgICAgICogcGxhdGZvcm0vU2Nyb2xsQW5pbWF0b3IuaDoKKyAgICAgICAgKFdlYkNvcmU6OlNj cm9sbEFuaW1hdG9yOjpTY3JvbGxBbmltYXRvcjo6Y29udGVudHNSZXNpemVkIGNvbnN0KToKKwog MjAyMS0wNS0xMiAgRnJlZGVyaWMgV2FuZyAgPGZ3YW5nQGlnYWxpYS5jb20+CiAKICAgICAgICAg UkVMRUFTRV9BU1NFUlQobV9zZWxlY3Rpb24tPmlzTm9uZSgpKSBmYWlscyBpbiBEb2N1bWVudDo6 cmVtb3ZlZExhc3RSZWYKZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJDb3JlL3BsYXRmb3JtL1Njcm9s bEFuaW1hdG9yLmNwcCBiL1NvdXJjZS9XZWJDb3JlL3BsYXRmb3JtL1Njcm9sbEFuaW1hdG9yLmNw cAppbmRleCA4ZDYyZTAyOTYzMGUuLjhhYmM4YWZmYjM0YiAxMDA2NDQKLS0tIGEvU291cmNlL1dl YkNvcmUvcGxhdGZvcm0vU2Nyb2xsQW5pbWF0b3IuY3BwCisrKyBiL1NvdXJjZS9XZWJDb3JlL3Bs YXRmb3JtL1Njcm9sbEFuaW1hdG9yLmNwcApAQCAtMzc5LDYgKzM3OSwxMSBAQCB2b2lkIFNjcm9s bEFuaW1hdG9yOjpjYW5jZWxBbmltYXRpb25zKCkKICNlbmRpZgogfQogCit2b2lkIFNjcm9sbEFu aW1hdG9yOjpjb250ZW50c1Jlc2l6ZWQoKSBjb25zdAoreworICAgIG1fc2Nyb2xsQW5pbWF0aW9u LT51cGRhdGVWaXNpYmxlTGVuZ3RocygpOworfQorCiB2b2lkIFNjcm9sbEFuaW1hdG9yOjp3aWxs RW5kTGl2ZVJlc2l6ZSgpCiB7CiAgICAgbV9zY3JvbGxBbmltYXRpb24tPnVwZGF0ZVZpc2libGVM ZW5ndGhzKCk7CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9wbGF0Zm9ybS9TY3JvbGxBbmlt YXRvci5oIGIvU291cmNlL1dlYkNvcmUvcGxhdGZvcm0vU2Nyb2xsQW5pbWF0b3IuaAppbmRleCBi NjE2M2ExMjIwZmYuLjcwN2I4OWE2NTJjZiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvcGxh dGZvcm0vU2Nyb2xsQW5pbWF0b3IuaAorKysgYi9Tb3VyY2UvV2ViQ29yZS9wbGF0Zm9ybS9TY3Jv bGxBbmltYXRvci5oCkBAIC0xMTEsNyArMTExLDcgQEAgcHVibGljOgogICAgIHZpcnR1YWwgdm9p ZCBtb3VzZUV4aXRlZFNjcm9sbGJhcihTY3JvbGxiYXIqKSBjb25zdCB7IH0KICAgICB2aXJ0dWFs IHZvaWQgbW91c2VJc0Rvd25JblNjcm9sbGJhcihTY3JvbGxiYXIqLCBib29sKSBjb25zdCB7IH0K ICAgICB2aXJ0dWFsIHZvaWQgd2lsbFN0YXJ0TGl2ZVJlc2l6ZSgpIHsgfQotICAgIHZpcnR1YWwg dm9pZCBjb250ZW50c1Jlc2l6ZWQoKSBjb25zdCB7IH0KKyAgICB2aXJ0dWFsIHZvaWQgY29udGVu dHNSZXNpemVkKCkgY29uc3Q7CiAgICAgdmlydHVhbCB2b2lkIHdpbGxFbmRMaXZlUmVzaXplKCk7 CiAgICAgdmlydHVhbCB2b2lkIGNvbnRlbnRBcmVhRGlkU2hvdygpIHsgfQogICAgIHZpcnR1YWwg dm9pZCBjb250ZW50QXJlYURpZEhpZGUoKSB7IH0K