227337 2021-06-23 21:30:16 -0700 [Legacy line layout] Incorrect wrap position at <wbr> in "white-space: pre" content. 2021-06-30 21:31:21 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Local Build Unspecified Unspecified NEW InRadar P2 Normal --- 1 heycam webkit-unassigned bfulgham simon.fraser webkit-bug-importer zalan oldest_to_newest 1772177 0 432131 heycam 2021-06-23 21:30:16 -0700 Created attachment 432131 test Noticed this looking at https://developer.apple.com/documentation/coretext/1510813-ctfontgetglyphsforcharacters?language=objc. STR: 1. Open the attached test. 2. Click somewhere in the "Char" of "UniChar". 3. Notice that the line of text wraps (and not all of it gets repainted). Are we incorrectly computing the intrinsic minimum width of the text by not taking into account the word wrap opportunities? Doesn't reproduce with LFC for inline layout turned off. 1772273 1 zalan 2021-06-24 08:09:21 -0700 Yeah, it happens when legacy line layout and IFC disagrees on the layout. According to https://www.w3.org/TR/css-text-3/#white-space-property, white-space: pre -> "Lines only break at forced line breaks; content that does not fit within the block container overflows it." While <wbr> acts as a line breaking opportunity, it is not a forced line break. IFC layout also matches FF. Sadly, clicking on the content forces us to fallback to legacy line layout and it makes the content wrap and we fail to make the containing block taller (as the fallback code only runs the line layout and not the block one) We need to patch legacy line layout. 1772275 2 zalan 2021-06-24 08:16:02 -0700 >Are we incorrectly computing the intrinsic minimum width of the text by not taking into account the word wrap opportunities? The content in inside a fixed width containing block, so we don't really compute intrinsic width here. It's simply about ignoring the soft line break opportunities (<wbr>) and letting the content overflow as specified by the spec. 1773992 3 webkit-bug-importer 2021-06-30 21:31:21 -0700 <rdar://problem/80001586> 432131 2021-06-23 21:30:16 -0700 2021-06-23 21:30:16 -0700 test out.html text/html 304 heycam PCFET0NUWVBFIGh0bWw+CjxzdHlsZT4KLmNvbnRhaW5lciB7CiAgZm9udDogMTZweCBtb25vc3Bh Y2U7CiAgd2lkdGg6IDgwY2g7CiAgYmFja2dyb3VuZC1jb2xvcjogeWVsbG93Owp9CnByZSB7CiAg aGVpZ2h0OiAxMDBweDsKfQo8L3N0eWxlPgo8ZGl2IGNsYXNzPSJjb250YWluZXIiPgogIDxwcmU+ Ym9vbCBDVEZvbnRHZXRHbHlwaHNGb3JDaGFyYWN0ZXJzKENURm9udDx3YnI+UmVmIGZvbnQsIGNv bnN0IFVuaTx3YnI+Q2hhciAqY2hhcmFjdGVycywgQ0dHbHlwaCAqZ2x5cGhzLCBDRkluZGV4IGNv dW50KTs8L3ByZT4KPC9kaXY+Cg==