suggest not working on android (keydown keycode is always 229)

[mzechmeister]

The "$" cannot be captured with keydown or keyup.
See https://stackoverflow.com/questions/36753548/keycode-on-android-is-always-229.
The different behaviour between desktop and mobile browers is annoying.
Thus the suggestion list does not popup.

Alternatives could be oninput or onbeforeinput.
The behaviour can be tested here:
https://codepen.io/impressivewebs/pen/wvzKbVx?editors=0010
http://jsfiddle.net/vLga0fb9

onbeforeinput is triggered in android chrome, but .data seems to work only in latest version.
Some more experiences here: ckeditor/ckeditor5#3131.

[mzechmeister]

Finally solved by using oninput and deleting the $ with selection+range.

Note that onkeyup and onselectionchange are fired in different order on mobiles and desktop:
https://www.w3schools.com/code/tryit.asp?filename=GVJJ5PNFT6GA
See also
https://stackoverflow.com/a/69429589/11769765