Absolute positioned decoration widget cases duplicate Chinese punctuations input

[xiaody]

https://stackblitz.com/edit/typescript-pdavyjku?file=style.css,index.ts,index.html

This repo contains a simplified placeholder plugin we are using, and we notice this bug in recent versions of Chrome(at least Edge/131 and Chrome Canary/133; I also tried QQBrowser(chromium 116), which is ok), Windows specifically.

step 1: put cursor at the start of the line.

step 2: with Chinese IME on, type a Chinese comma(press ,), and with high chances we unexpectly got two commas.

notice only inputing punctuations causes this bug, not other Chinese characters like 你好 with a longer composition process.

Removing the position: aboslute of the placeholder somehow solves this magicly(with a very high chance but not 100%), but we'd prefer keeping the style so it looks better if the line is text-align: right, and the cursor won't jump if arrow keys are pressed.