Handle Delete in CompositionHelper

[ink404]

Details

Browser

Tested in chrome on Android device running SDK 12.

Version 4.19.0

Issue - relates to #3600

Deleting characters doesn't work as expected on Android since the CompositionHelper expects the diff to have > 1 length if there's a difference.

Steps:

• type: 1
• tap backspace button

expected:

• character is removed

actual:

• character remains, tapping backspace once more then removes character

Example:

• single character entry: https://user-images.githubusercontent.com/3418052/183525959-2bb604e9-76cb-4e91-89a8-da14663e7218.mp4
• many + press & hold to delete: https://user-images.githubusercontent.com/3418052/183528031-449451f7-eb3e-4e59-9970-e52922660ea7.mp4

[ink404]

@Tyriar Hi! This fixes a long standing issue for our use case.

Is there any chance this can be looked at in the next week?

[Tyriar]

Thanks for looking into this, I didn't test on Android but it doesn't seem to regress desktop and makes sense 👍