I have uploaded mintty 3.5.2 with the following changes:
Unicode and Emoji data
* Unicode 14.0 update.
Terminal features
* Fix (revert back) DECSDM (DECSET 80) Sixel Display mode (#1127,
xterm 369).
* Sound file playing OSC 440 (#1122).
* DECPS tone playing support (#1122).
* Fixed LED state glitch when ScrollLock is held in auto-repeat.
* Extended scope of area attributes change functions DECCARA and DECRARA.
* Unscroll sequence CSI +T, filling lines from scrollback buffer (kitty).
* Changed default BracketedPasteByLine=0 for consistent appearance.
Window handling
* Fixed -s max... options (#1124).
* Tweaked handling of positioning and size options.
* Always support negative position offset (#1123).
* Avoid position gap after Options Apply (#1126).
* Copy text: set proper clipboard timestamp.
The homepage is at http://mintty.github.io/
It also links to the issue tracker.
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Thomas