Remove Dasher (broken on Wayland)
Original bug report (k9glrflkhvubl7qe--- via Tails-testers):
- Dasher doesn't seem to work without Xwayland at all. I tried running it with GDK_BACKEND=wayland but received "option parsing failed: Cannot open display:" error. The issue related to native Wayland support is still open since 2017: https://github.com/dasher-project/dasher/issues/103
It seems the most up-to-date info relevant to Tails is https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=893726.
tl;dr: at least part of it should work (without GDK_BACKEND=wayland) for XWayland apps, but nothing works for native Wayland apps. Basic Tails functionality will be native Wayland in 5.8, so this is essentially equivalent to Dasher becoming useless.
I did not find any other equivalent software in Debian, so I'm afraid we're going to regress in terms of accessibility for some users (note that for other users, most notably visually impaired ones, 5.8 will improve things). This sucks, but I don't see any realistic way to avoid this.
I think we should remove Dasher for now.