Adapt dark mode based on system settings

[MariusBluem]

macOS Mojave is supporting dark mode and the Safari Technology Preview 68 is supporting automatically setting dark mode for homepages if set in system-settings. This seems to be handled via CSS prefers-color-scheme media query. Is it easy to support this? 🤔

Ref.: https://trac.webkit.org/changeset/237156/webkit

@skjnldsv @nextcloud/designers

[nextcloud-bot]

GitMate.io thinks possibly related issues are #1692 (Dark mode accessibility ), #11884 (Pretty URLs Breaks Dark Mode on Apache), #11656 (Dark Theme), #3289 (No WebDav Error when system is in single user mode), and #7218 (No feedback after password (re)set).

[skjnldsv]

@MariusBluem I've indeed seen a doc passed by last week.
We'll need to wait for this to land on safari stable I guess :)

[MorrisJobke]

@MariusBluem I've indeed seen a doc passed by last week.
We'll need to wait for this to land on safari stable I guess :)

Not that hard: https://developer.apple.com/safari/technology-preview/ 😉

[MorrisJobke]

Looks like this needs to wait for 17.