175468 2017-08-10 18:22:24 -0700 [GTK] stop kinetic scrolling when a zero movement is reached 2017-08-13 23:23:43 -0700 1 1 1 Unclassified WebKit WebKitGTK Other Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 christian webkit-unassigned bugs-noreply cgarcia mcatanzaro oldest_to_newest 1337769 0 christian 2017-08-10 18:22:24 -0700 When the kinetic scrolling reduces it's speed, there can be multiple frames where the movement is zero pixels (followed by a 1 pixel movement later on). This causes a "jitter" right at the end of the scroll which makes it feel less quality than other platforms. Instead, we should just clamp it as soon as we get a zero movement. This is what I put in Gtk+ to avoid the same issue. https://git.gnome.org/browse/gtk+/commit/?h=gtk-3-22&id=4f63d839550f7a9038b391e7d3e1e6fc8bdfafa6 1337874 1 317927 cgarcia 2017-08-11 06:33:50 -0700 Created attachment 317927 Patch Thank you Christian! 1338287 2 cgarcia 2017-08-13 23:23:43 -0700 Committed r220638: <http://trac.webkit.org/changeset/220638> 317927 2017-08-11 06:33:50 -0700 2017-08-11 08:15:54 -0700 Patch wcore-kinetic.diff text/plain 2278 cgarcia ZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZyBiL1NvdXJjZS9XZWJDb3JlL0No YW5nZUxvZwppbmRleCAyMDBiY2ZmNzNkYy4uM2Y3MzYwZDRlMTMgMTAwNjQ0Ci0tLSBhL1NvdXJj ZS9XZWJDb3JlL0NoYW5nZUxvZworKysgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKQEAgLTEs NSArMSwyMiBAQAogMjAxNy0wOC0xMSAgQ2FybG9zIEdhcmNpYSBDYW1wb3MgIDxjZ2FyY2lhQGln YWxpYS5jb20+CiAKKyAgICAgICAgW0dUS10gc3RvcCBraW5ldGljIHNjcm9sbGluZyB3aGVuIGEg emVybyBtb3ZlbWVudCBpcyByZWFjaGVkCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3Jn L3Nob3dfYnVnLmNnaT9pZD0xNzU0NjgKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9P UFMhKS4KKworICAgICAgICBUaGlzIGlzIEdUSysgY2hhbmdlIGJ5IENocmlzdGlhbiBIZXJnZXJ0 LgorICAgICAgICBodHRwczovL2dpdC5nbm9tZS5vcmcvYnJvd3NlL2d0aysvY29tbWl0Lz9oPWd0 ay0zLTIyJmlkPTRmNjNkODM5NTUwZjdhOTAzOGIzOTFlN2QzZTFlNmZjOGJkZmFmYTYKKworICAg ICAgICBXaGVuIHRoZSBraW5ldGljIHNjcm9sbGluZyByZWR1Y2VzIGl0cyBzcGVlZCwgdGhlcmUg Y2FuIGJlIG11bHRpcGxlIGZyYW1lcyB3aGVyZSB0aGUgbW92ZW1lbnQgaXMgemVybyBwaXhlbHMs CisgICAgICAgIGZvbGxvd2VkIGJ5IGEgMSBwaXhlbCBtb3ZlbWVudCBsYXRlciBvbi4gVGhpcyBj YXVzZXMgYSAiaml0dGVyIiByaWdodCBhdCB0aGUgZW5kIG9mIHRoZSBzY3JvbGwgd2hpY2ggbWFr ZXMgaXQKKyAgICAgICAgZmVlbCBsZXNzIHF1YWxpdHkgdGhhbiBvdGhlciBwbGF0Zm9ybXMuIElu c3RlYWQsIHdlIHNob3VsZCBqdXN0IGNsYW1wIGl0IGFzIHNvb24gYXMgd2UgZ2V0IGEgemVybyBt b3ZlbWVudC4KKworICAgICAgICAqIHBsYXRmb3JtL1Njcm9sbEFuaW1hdGlvbktpbmV0aWMuY3Bw OgorICAgICAgICAoV2ViQ29yZTo6U2Nyb2xsQW5pbWF0aW9uS2luZXRpYzo6UGVyQXhpc0RhdGE6 OmFuaW1hdGVTY3JvbGwpOgorCisyMDE3LTA4LTExICBDYXJsb3MgR2FyY2lhIENhbXBvcyAgPGNn YXJjaWFAaWdhbGlhLmNvbT4KKwogICAgICAgICBbU291cF0gQ2Fubm90IGFjY2VzcyBIVFRQUyBz aXRlcyB1c2luZyBhIEhUVFAgcHJveHkgdGhhdCByZXF1aXJlcyBhdXRoZW50aWNhdGlvbgogICAg ICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTc1Mzc4CiAKZGlm ZiAtLWdpdCBhL1NvdXJjZS9XZWJDb3JlL3BsYXRmb3JtL1Njcm9sbEFuaW1hdGlvbktpbmV0aWMu Y3BwIGIvU291cmNlL1dlYkNvcmUvcGxhdGZvcm0vU2Nyb2xsQW5pbWF0aW9uS2luZXRpYy5jcHAK aW5kZXggNmU5YjlhMDY1M2EuLmExZWExNGY0NGQ4IDEwMDY0NAotLS0gYS9Tb3VyY2UvV2ViQ29y ZS9wbGF0Zm9ybS9TY3JvbGxBbmltYXRpb25LaW5ldGljLmNwcAorKysgYi9Tb3VyY2UvV2ViQ29y ZS9wbGF0Zm9ybS9TY3JvbGxBbmltYXRpb25LaW5ldGljLmNwcApAQCAtODEsNiArODEsOCBAQCBT Y3JvbGxBbmltYXRpb25LaW5ldGljOjpQZXJBeGlzRGF0YTo6UGVyQXhpc0RhdGEoZG91YmxlIGxv d2VyLCBkb3VibGUgdXBwZXIsIGRvdQogCiBib29sIFNjcm9sbEFuaW1hdGlvbktpbmV0aWM6OlBl ckF4aXNEYXRhOjphbmltYXRlU2Nyb2xsKFNlY29uZHMgdGltZURlbHRhKQogeworICAgIGF1dG8g bGFzdFBvc2l0aW9uID0gbV9wb3NpdGlvbjsKKyAgICBhdXRvIGxhc3RUaW1lID0gbV9lbGFwc2Vk VGltZTsKICAgICBtX2VsYXBzZWRUaW1lICs9IHRpbWVEZWx0YTsKIAogICAgIGRvdWJsZSBleHBv bmVudGlhbFBhcnQgPSBleHAoLWRlY2VsRnJpY3Rpb24gKiBtX2VsYXBzZWRUaW1lLnZhbHVlKCkp OwpAQCAtOTMsNyArOTUsNyBAQCBib29sIFNjcm9sbEFuaW1hdGlvbktpbmV0aWM6OlBlckF4aXNE YXRhOjphbmltYXRlU2Nyb2xsKFNlY29uZHMgdGltZURlbHRhKQogICAgIH0gZWxzZSBpZiAobV9w b3NpdGlvbiA+IG1fdXBwZXIpIHsKICAgICAgICAgbV9wb3NpdGlvbiA9IG1fdXBwZXI7CiAgICAg ICAgIG1fdmVsb2NpdHkgPSAwOwotICAgIH0gZWxzZSBpZiAoZmFicyhtX3ZlbG9jaXR5KSA8IDEp IHsKKyAgICB9IGVsc2UgaWYgKGZhYnMobV92ZWxvY2l0eSkgPCAxIHx8IChsYXN0VGltZSAmJiBm YWJzKG1fcG9zaXRpb24gLSBsYXN0UG9zaXRpb24pIDwgMSkpIHsKICAgICAgICAgbV9wb3NpdGlv biA9IHJvdW5kKG1fcG9zaXRpb24pOwogICAgICAgICBtX3ZlbG9jaXR5ID0gMDsKICAgICB9Cg==