The reply pagination logic is a bit weird rn though.

fixes #1203

Apparently on windows `Qt.inputMethod.visible` is always true when an input method is installed. Also on windows even after removing the check enter is still consumed by the input method, not nheko.

* First draft of unread line feature.

* Minor visual fix.

* Removed unnecessary ternary operator.

* Extended unread line functionality to work on minimised window or focusing another window.

* Fix for unread line not showing when last read message is hidden.

* Minor performance improvement. Fix for misbehaving event2order DB at application start.

* Fix for possible performance issues when user has joined a large number of rooms.

* Fix for breaking macos and clazy builds.

* Changed on windows focus function to refresh unread line if room is unread.

* Unread line is removed when user sends a message.

* Linting.

* Fixed unread line to work in standalone room windows.

* Switch isRoomUnread for index 0.

* Merged try/catch blocks.

* Fix for crash on opening a room invite.

* Call fullyReadEventId function when used instead of storing it and passing it through.

* Function that was meant to sync the unread line was relying on an async function, oops.

* Linting again.

* More linting...

* Minor changes.

relates to #1168

This addresses a few problems with reaction colors:

- The state-checking conditionals for reaction text, background, and border
  were inconsistent, making it difficult to choose colors for each state
  (normal, hovered, and self reactions) that worked well in all themes.
- The QPalette::Highlight color was being misused as a text/foreground color.
  This color role is intended for background areas.  It has little contrast
  against the background in themes like KDE Plasma's Breeze High Contrast,
  so using it for text and icons makes those things difficult to read.
  https://doc.qt.io/qt-5/qpalette.html#ColorRole-enum
- The reaction border was drawn in the same color as normal text, making it
  so bright in some dark themes that it distracted from reading nearby text.

Fixes Nheko-Reborn/nheko#1159

This helps with #1065, although I think making sure the message input box gets focus by default would be worthwhile.

see #1042
see #483

Requires MSC3266

Fixes #1129

fixes #1114