105366 2012-12-18 16:29:57 -0800 [CSS Regions] webkitregionlayoutupdate is triggered for all flows even though only one flow has to be updated 2014-05-08 08:23:52 -0700 1 1 1 Unclassified WebKit Web Inspector (Deprecated) 528+ (Nightly build) All All RESOLVED INVALID AdobeTracked P2 Normal --- 111969 57312 1 johanneswilm abucur abucur apavlov eric esprehn+autocc keishi loislo mibalan mihnea ojan.autocc pfeldman pmuellr rcaliman vsevik web-inspector-bugs WebkitBugTracker webkit.review.bot yurys oldest_to_newest 794160 0 johanneswilm 2012-12-18 16:29:57 -0800 If any change to any region is done (using contenteditable=true), a webkitregionlayoutupdate event is triggered for all flows, no matter whether anything was actually changed in any of the regions belonging to other flows than the one that was just edited. I have attached a self-explanatory test file 794163 1 180054 johanneswilm 2012-12-18 16:31:08 -0800 Created attachment 180054 a file showing how the webkitregionlayoutupdate event is triggered for all flows, even though only one flow has been changed 850201 2 192030 abucur 2013-03-07 10:03:21 -0800 Created attachment 192030 Patch 850212 3 abucur 2013-03-07 10:10:13 -0800 (In reply to comment #1) > Created an attachment (id=180054) [details] > a file showing how the webkitregionlayoutupdate event is triggered for all flows, even though only one flow has been changed This patch fixes most of the unnecessary webkitregionlayoutupdate event dispatches for autoheight regions. It may not be complete though considering how the event is currently defined (triggered every time a flow thread is laid out). Would your use cases be covered if the event changes behavior to be dispatched only when: - an existing region changes the overset property - a region is added to the chain - a region is removed from the chain ? 850279 4 192030 hyatt 2013-03-07 10:52:59 -0800 Comment on attachment 192030 Patch r=me 850287 5 johanneswilm 2013-03-07 10:58:56 -0800 @Andrei: At Sourcefabric, our use cases would be covered with the cases you mention. I think this would cover the spec as well, right? 850415 6 johanneswilm 2013-03-07 13:07:15 -0800 We would still like an event when an element moves from one region to another, but that should be an event quite apart from this one. 858210 7 192030 abucur 2013-03-19 06:20:38 -0700 Comment on attachment 192030 Patch Unfortunately this patch doesn't treat correctly the complex dependencies between regions. The event as defined right now cannot be implemented easily to dispatch only on the flows that change. See the attached complex example. 858216 8 johanneswilm 2013-03-19 06:27:22 -0700 so this means it's unfixable? Or the CSS specification has to be changed? 858217 9 193808 abucur 2013-03-19 06:27:25 -0700 Created attachment 193808 Complex example Complex example of dependencies between flow threads. When adding the text to the last black border div, the red region with percentage height changes, the red flow is invalidated and all the red regions reflowed. However, the first red region with percentage (near the top blue region) depends on the blue region which is not invalidated. Because of this, the partial layout doesn't give the same results as the full layout obtained when resizing the window: in a full layout the red flow is computed as if the blue region has a height of 0 (as specified). If we invalidate the blue region during the partial layout we will also dispatch regionlayoutupdate for the blue thread as well defeating the initial purpose of the fix. 858248 10 abucur 2013-03-19 07:07:14 -0700 (In reply to comment #8) > so this means it's unfixable? Or the CSS specification has to be changed? It means it's preferable to break the "regionlayoutupdate" event in two events like "regionoversetchanged" and "regionrangeschanged". This split needs to be backed by the CSS specification so we're discussing with the editors about the proposal. The "regionoversetchanged" event would be dispatched as we discussed earlier. The "regionrangeschanged" event would be dispatched when the content inside a region changes (basically when block fragments change). 900259 11 michelangelo 2013-06-13 11:50:22 -0700 Still repros on today's nightly (r151543) 908438 12 mibalan 2013-07-15 09:53:58 -0700 The regionlayoutupdate event still has the bug, but not the regionoversetchange. To be closed once the regionlayoutupdate event is removed. 980239 13 192030 ossy 2014-02-13 04:06:01 -0800 Comment on attachment 192030 Patch Cleared David Hyatt's review+ from obsolete attachment 192030 so that this bug does not appear in http://webkit.org/pending-commit. 1007620 14 mihnea 2014-05-08 08:23:52 -0700 As regionlayoutupdate was removed in https://bugs.webkit.org/show_bug.cgi?id=132564, closing this bug as invalid. 180054 2012-12-18 16:31:08 -0800 2012-12-18 16:31:08 -0800 a file showing how the webkitregionlayoutupdate event is triggered for all flows, even though only one flow has been changed test_regions.html text/html 1269 johanneswilm PGh0bWw+CjxoZWFkPgo8dGl0bGU+dGVzdCB0cmlnZ2VyIGluZGl2aWR1YWwgZmxvdyBldmVudHM8 L3RpdGxlPgo8L2hlYWQ+Cjxib2R5Pgo8cD5CZWxvdyBhcmUgdHdvIHJlZ2lvbnMuIElmIHRoZSBm aXJzdCByZWdpb24gaXMgdXBkYXRlZCBieSBlbnRlcmluZyB0ZXh0LCBhbiBhbGVydCBpcyBkaXNw bGF5ZWQuIFRoZSBhbGVydCBpcyBob3dldmVyIGFsc28gZGlzcGxheWVkIHdoZW4gb25lIGVudGVy 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