Fixed
- A video looked a little duller while a hover card, the address pop-up, the find bar,
the swipe arrow or the screenshot buttons were open over it on macOS (#569), as it did
under the compact sidebar before 2.117.3. To blur the page behind them, Zen has to draw
the page itself, and drawn that way a video comes out duller than macOS shows it. While
the open tab shows a video on screen, they're all solid now, as the compact sidebar is,
so the video keeps its colours; everywhere else they stay see-through. Thanks kcussiefil.