2018 regression #1: Last good revision: (2018-05-04): first line is visible (not blinking), second line blinks. First bad revision: (2018-05-05): first line is visible (not blinking), second line blinks away & stays missing. Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=5207b1392b11db534550a5eb801302e6dbb58f95&tochange=9a2eac450781b026b42c44ca8f0f92bb0846b6e2 --> Probably bug 1458814 2018 regression #2: Last good revision: (2018-07-19) first line is visible (not blinking), second line blinks away & stays missing. First bad revision: (2018-07-20) first line blinks away & stays missing, second line blinks away & stays missing. Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=690cb3015db6645b335ac4835a50073cb6a3e23c&tochange=6eec814dea789707d04f42bbb01097d44532e2a9 --> Probably bug 1450250 (Though this behavior-change -- "2018 regression #2" -- was arguably an improvement, since it made the `<use>` element (the first line) match the rendering of its target (the second line) instead of being stranded with a different rendering.)
Bug 536454 Comment 7 Edit History
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2018 regression #1: Last good revision: (2018-05-04): first line is visible (not blinking), second line blinks. First bad revision: (2018-05-05): first line is visible (not blinking), second line blinks away & stays missing. Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=5207b1392b11db534550a5eb801302e6dbb58f95&tochange=9a2eac450781b026b42c44ca8f0f92bb0846b6e2 --> Probably bug 1458814 2018 regression #2: Last good revision: (2018-07-19) first line is visible (not blinking), second line blinks away & stays missing. First bad revision: (2018-07-20) first line blinks away & stays missing, second line blinks away & stays missing. Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=690cb3015db6645b335ac4835a50073cb6a3e23c&tochange=6eec814dea789707d04f42bbb01097d44532e2a9 --> Probably bug 1450250 (Though this behavior-change -- "2018 regression #2" -- was arguably an improvement, since it made the `<use>` clone scenario (the first line) match the rendering of a non-use-clone scenario (the second line) instead of being inexplicably different.)