152608 2015-12-31 00:06:01 -0800 Uncaught Exception: TypeError: undefined is not an object (evaluating 'this._dependencies.has') 2016-01-06 12:24:31 -0800 1 1 1 Unclassified WebKit Web Inspector WebKit Nightly Build All All RESOLVED DUPLICATE 152497 InRadar P2 Major --- 1 hi webkit-unassigned bburg graouts joepeck mattbaker nvasilyev timothy webkit-bug-importer oldest_to_newest 1151687 0 268031 hi 2015-12-31 00:06:01 -0800 Created attachment 268031 WIP-148254.diff ------- Auto-generated details: Inspected URL: http://www.apple.com/ Loading completed: true Frontend User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_2) AppleWebKit/602.1.15+ (KHTML, like Gecko) Uncaught exceptions: - TypeError: undefined is not an object (evaluating 'this._dependencies.has') (at VisualStylePropertyEditor.js:534:115) ------- * STEPS TO REPRODUCE 1. Apply the attached "WIP-148254.diff" (was working on https://bugs.webkit.org/show_bug.cgi?id=148254) 2. Open the inspector to the body element on "https://www.apple.com/" 3. Open the Visual Styles sidebar panel in the Elements tab 4. Select Style Rules > This Element 5. Open the Layout > Position section 6. Change the value of the select element next to Type from Static (should be greyed out) to Relative 7. Switch to a different selector under Style Rules (confirm that the yellow warning icons disappear from the other editors in the Position section) 8. Switch back to This Element and change the select element next to Type back to Static 9. Switch to a different selector under Style Rules (confirm that the yellow warning icons reappear from the other editors in the Position section) At this point, one of two things can happen: 1) Step 9 will result in an error that crashes the inspector. 2) Step 9 will work just fine (and continue to do so no matter how many times steps 6-9 are repeated). In this case, simply open inspector^2 and enter the following command into the console to see the error: `WebInspector.cssStyleDetailsSidebarPanel._visualStyleDetailsPanel._groups.position.properties.zIndex._checkDependencies()` * NOTES From what I was able to investigate, it looks like the value of `this` inside the arrow function on UserInterface/Views/VisualStylePropertyEditor.js:531 is simply empty (as in when I tried to console.log() the value inside the arrow function the output in the console was just a blank line). Maybe an issue with arrow functions? 1151688 1 webkit-bug-importer 2015-12-31 00:06:17 -0800 <rdar://problem/24028126> 1151885 2 bburg 2016-01-01 19:53:42 -0800 Happy new year. We ran into this in https://bugs.webkit.org/show_bug.cgi?id=152471 as well. You can convert it to not use arrow functions, and add a FIXME referencing the JSC bug. 1153140 3 bburg 2016-01-06 12:24:31 -0800 *** This bug has been marked as a duplicate of bug 152497 *** 268031 2015-12-31 00:06:01 -0800 2015-12-31 00:06:27 -0800 WIP-148254.diff WIP-148254.diff text/plain 10200 hi ZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJJbnNwZWN0b3JVSS9Mb2NhbGl6YXRpb25zL2VuLmxwcm9q L2xvY2FsaXplZFN0cmluZ3MuanMgYi9Tb3VyY2UvV2ViSW5zcGVjdG9yVUkvTG9jYWxpemF0aW9u cy9lbi5scHJvai9sb2NhbGl6ZWRTdHJpbmdzLmpzCmluZGV4IDg0OTNmNjNjNGY1YjIwNzZhMjIy ZGNhOTY3YWFlMDNkMzU3MTM1ZDUuLjdlZWUzNDBmOTBiYWNiYzJlY2VlNmQ0Y2Q2ZGE2MTI4MGY2 NWFjYWQgMTAwNjQ0CkdJVCBiaW5hcnkgcGF0Y2gKZGVsdGEgMTU5CnpjbWNjZmhHb199bUpSJjc+ eCZ0Ujg4UjkyN302T083K2VAcTg0Nz9uazBBdzJDSWUrc2YkfENyOFZ0QDFgMyQqMAp2KjswbFFw alpsbkNXOTQmRG97PnxBcj5mYTMmY3RjekNpVVBuI1k0fDtOJU58YGtUM1QyVVlfQnt6TV8qCgpk ZWx0YSAxNApXY21iUkJqXilsOW1KUiY3SD1vX0BUTVltXilDYmw4CgpkaWZmIC0tZ2l0IGEvU291 cmNlL1dlYkluc3BlY3RvclVJL1VzZXJJbnRlcmZhY2UvVmlld3MvVmlzdWFsU3R5bGVEZXRhaWxz 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