205651 2019-12-30 13:23:06 -0800 REGRESSION(r253360): [GTK] Page becomes blank during the back/forward gesture animation if loading triggers PSON 2020-05-05 05:22:27 -0700 1 1 1 Unclassified WebKit WebKitGTK WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=205650 P2 Normal --- 1 alicem webkit-unassigned bugs-noreply cassidy cedric.bellegarde mcatanzaro oldest_to_newest 1601935 0 alicem 2019-12-30 13:23:06 -0800 Related to https://bugs.webkit.org/show_bug.cgi?id=205650, but it also happens with AC mode. Another regression from https://github.com/WebKit/webkit/commit/94d2fcd0c2eb2399b31253290153676de5cf21ee Is it possible to somehow not immediately blank the drawing area on PSON and show the previous contents until there's something new to draw (which the new process won't do because layer tree state will be frozen)? 1626387 1 mcatanzaro 2020-03-05 16:28:58 -0800 Well this seems bad. 1629067 2 cedric.bellegarde 2020-03-11 23:19:43 -0700 I guess it's related, while loading a new page, WebKitGTK randomly flashes. https://www.youtube.com/watch?v=BU0ScSair84 1647101 3 alicem 2020-04-29 12:28:30 -0700 Not really, this is only about the gesture. During the gesture we show the current page (as it is) sliding away or being there while another sheet slides over it, and that other sheet is a static screenshot. After the gesture is done, the actual page is completely invisible, and we show the screenshot only and wait until the new page has loaded enough. After it's enough, we remove the screenshot and it's done. Previously we started loading new page only after the gesture is done, i.e. the drawing area is invisible. Now it starts earlier, hence you can see the new page starting loading while it still shouldn't. There are some calls to prevent this on Apple side, we just need to implement them for CoordinatedDrawingArea really. 1649159 4 alicem 2020-05-05 05:22:27 -0700 Ah no, that comment was about 205650, sorry. Still not related to flashing though, it's about not blanking the drawing area on PSON until layer tree state is unfrozen.