240410 2022-05-13 19:49:29 -0700 Changing text color and removing line-clamp on hover causes text to disappear permanently 2022-05-19 12:57:19 -0700 1 1 1 Unclassified WebKit Layout and Rendering Safari 15 Mac (Apple Silicon) macOS 12 RESOLVED FIXED InRadar P2 Normal --- 1 jordan zalan bfulgham changseok darin esprehn+autocc ews-watchlist glenn kondapallykalyan pdr simon.fraser webkit-bug-importer zalan oldest_to_newest 1868943 0 459339 jordan 2022-05-13 19:49:29 -0700 Created attachment 459339 A short example that reproduces the issue In Safari 15.4, as well as the latest nightly build (`250551@main`), when you have an element that: 1. Has it's text truncated using `-webkit-box-orient` and `-webkit-line-clamp` 2. Changes the rendered color on `:hover` 3. Unsets, reverts, or otherwise removes the line-clamp on `:hover` 4. Has an "auto" height Then, the text will change color and render all lines for as long as you hover. However, once the pointer leaves the element it "permanently" collapses to zero height and effectively disappears. The reported client height for the element in JS is 0px. I've attached a file that reproduces the bug but for a quicker reproduction here is a jsfiddle link: https://jsfiddle.net/d3nqryke/ Observational notes: - Equivalent colors specified using different syntax do not cause the bug. The *rendered* color must change. - Specifying a non-auto height or flex-basis in a flex container prevents the bug - Forcing a repaint / re-layout by toggling the any of the pseudo-class styles (:active, :hover, :focus, :visited) in the Safari Dev Tools on the element itself or any ancestor element will cause the element to re-appear temporarily until you hover and leave it again. - Attempting to force a layout calculation / reflow using `clientTop`/`clientLeft`/etc… properties on element or document do not cause affected elements to re-appear. 1868944 1 zalan 2022-05-13 20:22:34 -0700 Oh wow. Thanks for the report. Very curious. Will look into it. 1869011 2 459356 zalan 2022-05-14 09:49:37 -0700 Created attachment 459356 Test reduction 1869012 3 zalan 2022-05-14 09:53:56 -0700 B---YGLS- --* RenderView at (0,0) size 1385x753 renderer->(0x1370007b0) B-----LS- -- HTML RenderBlock at (0,0) size 1385x753 renderer->(0x137001640) node->(0x137004dd0) B-------- -- BODY RenderBody at (8,8) size 1369x737 renderer->(0x137001780) node->(0x1370050d0) B--O--LS- -- DIV RenderDeprecatedFlexibleBox at (0,0) size 100x0 renderer->(0x137002f60) node->(0x1370051f0) (layout overflow 0,0 100x90) B---YG--- -- RenderBlock at (0,0) size 100x0 renderer->(0x137002c50) (layout overflow 0,0 100x90) (visual overflow 0,0 100x90) -------- -- line at (0.00,0.00) size (100.00x18.00) baseline (14.00) enclosing top (0.00) bottom (18.00) -------- -- Inline level boxes: -------- -- Inline box at (0.00,0.00) size (97.78x18.00) -------- -- Runs: -------- -- box box at (0.00,0.00) size 97.78x18.00 -------- -- text box at (0.00,0.00) size 97.78x18.00 box(0, 16) ^^ The RenderDeprecatedFlexibleBox's height computes to 0px. 1869029 4 459360 zalan 2022-05-14 13:28:51 -0700 Created attachment 459360 Patch 1869036 5 ews-feeder 2022-05-14 15:40:51 -0700 Committed r294211 (250569@main): <https://commits.webkit.org/250569@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 459360. 1869037 6 webkit-bug-importer 2022-05-14 15:41:14 -0700 <rdar://problem/93296716> 1869291 7 459360 darin 2022-05-16 10:01:43 -0700 Comment on attachment 459360 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=459360&action=review > Source/WebCore/rendering/RenderDeprecatedFlexibleBox.cpp:189 > + if (hadLineClamp && !hasLineClamp) This if statement doesn’t have to check both. 1869748 8 zalan 2022-05-17 11:47:38 -0700 (In reply to Darin Adler from comment #7) > Comment on attachment 459360 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=459360&action=review > > > Source/WebCore/rendering/RenderDeprecatedFlexibleBox.cpp:189 > > + if (hadLineClamp && !hasLineClamp) > > This if statement doesn’t have to check both. Indeed. Thanks! 1870382 9 zalan 2022-05-19 08:19:28 -0700 Reopening to attach new patch. 1870383 10 459591 zalan 2022-05-19 08:19:30 -0700 Created attachment 459591 [fast-cq]Patch 1870515 11 ews-feeder 2022-05-19 12:57:16 -0700 Committed r294503 (250760@main): <https://commits.webkit.org/250760@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 459591. 459339 2022-05-13 19:49:29 -0700 2022-05-13 19:49:29 -0700 A short example that reproduces the issue bug.html text/html 774 jordan PHN0eWxlPgogIGRpdiB7IHdpZHRoOiAyNzVweDsgfQoKICBwIHsKICAgIG92ZXJmbG93OiBoaWRk ZW47CiAgICBkaXNwbGF5OiAtd2Via2l0LWJveDsKICAgIC13ZWJraXQtYm94LW9yaWVudDogdmVy dGljYWw7CiAgICAtd2Via2l0LWxpbmUtY2xhbXA6IDI7CiAgfQoKICBwOmhvdmVyIHsKICAgIC8q IEhhcHBlbnMgd2l0aCB1bnNldCwgcmV2ZXJ0LCBpbml0aWFsLCBhbmQgaW5oZXJpdCBpbiB0aGlz IGNvbnRleHQgKi8KICAgIC13ZWJraXQtbGluZS1jbGFtcDogdW5zZXQ7CiAgICBjb2xvcjogcmVk OwogIH0KPC9zdHlsZT4KCjxkaXY+CiAgdGVzdAogIDxwPgogICAgTG9yZW0gaXBzdW0gZG9sb3Ig c2l0IGFtZXQsIGNvbnNlY3RldHVyIGFkaXBpc2ljaW5nIGVsaXQuIE1hZ25hbSBtYWlvcmVzIGRp Y3RhIHJlcnVtIG5pc2kgc2l0LCBxdWFtIGlwc2FtIGVycm9yIHF1b3Mgdm9sdXB0YXRlIGFkPyBF c3NlIG1hZ25pIGZ1Z2l0IG5hbSBpbmNpZHVudCBlYXF1ZSBkb2xvcmVzIG51bXF1YW0sIGFjY3Vz YW11cyBmdWdhLgogIDwvcD4KPC9kaXY+CjxkaXY+CiAgdGVzdAogIDxwPgogICAgTG9yZW0gaXBz 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2022-05-19 12:57:17 -0700 [fast-cq]Patch bug-240410-20220519081929.patch text/plain 1279 zalan RnJvbSA5YzI3MzAwOGM1ZTYzMWI1OTQwYWUwNzNiZTY2Y2JlMzNlZWZmZjFkIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBBbGFuIEJ1anRhcyA8emFsYW5AYXBwbGUuY29tPgpEYXRlOiBU aHUsIDE5IE1heSAyMDIyIDA4OjE0OjM0IC0wNzAwClN1YmplY3Q6IFtQQVRDSF0gQ2hhbmdpbmcg dGV4dCBjb2xvciBhbmQgcmVtb3ZpbmcgbGluZS1jbGFtcCBvbiBob3ZlciBjYXVzZXMKIHRleHQg dG8gZGlzYXBwZWFyIHBlcm1hbmVudGx5IGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVn LmNnaT9pZD0yNDA0MTAKClJldmlld2VkIGJ5IERhcmluIEFkbGVyLgoKQWRkcmVzcyBwb3N0LWxh bmRpbmcgcmV2aWV3IGNvbW1lbnQuCiogU291cmNlL1dlYkNvcmUvcmVuZGVyaW5nL1JlbmRlckRl cHJlY2F0ZWRGbGV4aWJsZUJveC5jcHA6CihXZWJDb3JlOjpSZW5kZXJEZXByZWNhdGVkRmxleGli bGVCb3g6OnN0eWxlV2lsbENoYW5nZSk6Ci0tLQogU291cmNlL1dlYkNvcmUvcmVuZGVyaW5nL1Jl bmRlckRlcHJlY2F0ZWRGbGV4aWJsZUJveC5jcHAgfCAyICstCiAxIGZpbGUgY2hhbmdlZCwgMSBp bnNlcnRpb24oKyksIDEgZGVsZXRpb24oLSkKCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9y 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