Highlights for users

• (Android) Support Android 8. (#1898)
• (Android) Fix crash on opening unsupported types of images. (#1973)
• Fill in topic properly on quote-and-reply. (#1469)
• Too many other improvements and fixes to describe them all here.

Highlights for developers

• User-visible changes not described above:

  • More error reporting on malformed events or register-queue failure. (#1083, #890)
  • Adjust design of "All channels" page to more resemble "Channels". (#1914)
  • Revise design of empty-page placeholders. (PR #1946)
  • Better handle unavailable image emoji in user status. (PR #1928)
  • Update messages in unsubscribed channels when re-fetched. (PR #1912)
  • Use max_topic_length instead of hardcoded value of 60. (#307)
  • Make settings page scrollable. (#1904)
  • Upgrade Flutter. (PR #1971, fixing #1973)
  • Make unread-count badges and topic-list items larger. (PR #1959)
  • Update translations. (PR #1975)

• Resolved: #890, #1083, #1898, #1914, PR #1946, PR #1928, PR #1912, #307, #1904, #1973, #1469, PR #1959, PR #1975

sha256sum -c <<EOF
d2584f2dfad901f0d8b83c0d713211a287f400efaeac161d5645b73ecd380096  app-release.apk
4d5c380031a6ac76b5a6fd4fb26faad9fb06de82bd6fe173cab408c86b4b9853  app-release.aab
EOF