939.01 KB, application/zip
>>> My Info: Win7_64, Nightly 49, 32bit, ID 20160526082509 STR_1: 1. Extract attached "testcase 1.zip" in a folder with short full name 2. Open .htm file STR_2: (origin of STR_1) 1. Open https://vk.com/zhukov_vladislav_nikolaevich?z=photo-44760286_394358437%2Fwall148237688_4725 2. Hover mouse over the fake scrollbar in comments section at the right from the image 3. Rotate mouse wheel down once, then immediately rotate mouse wheel up once STR_3: 1. Extract attached "testcase 1.zip" in a folder with short full name 2. Open .htm file 3. Open responsive design view (Ctrl+Shift+M), set page size to 4000x480 4. Set zoom to 170%, scroll responsive design view so that fake scrollbar became visible AR: HWA enabled: Rounded borders of fake scrollbar twitch to the left and right by ~1px. (STR_3 - ~3px) HWA disabled: The whole scrollbar twitches to the left and right (compresses/un-compresses) ER: Parts of scrollbar shouldn't twitch This is regression. Firefox 28 is unaffected, Nightly 49 is affected.
Narrowed nightly regression window from [2014-07-23, 2014-07-25] (2 days) to [2014-07-23, 2014-07-24] (1 days) (~0 steps left) Got as far as we can go bisecting nightlies... Last good revision: 82df3654cd80 (2014-07-23) First bad revision: a91ec42d6a9c (2014-07-24) Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=82df3654cd80&tochange=a91ec42d6a9c
I can't reproduce this, but it's probably the same as bug 1328032. It has the same regression window and similar-sounding symptoms.
8 months ago
Too late for 51 and we don't plan to have dot release for 51. Mark 50/51 won't fix.