Page Unresponsive in alphatex-editor.html when starting a new line with `\`

[lannka]

Expected Results

Editor playground should work with multi-track feature

Observed Results

While trying to use the editor playground to test the multi-track feature in AlphaTex, I hit an unresponsive page every time when I try to start a new line with \ char.

Steps to Reproduce

1. In a local build, open http://localhost:8080/playground/alphatex-editor.html#
2. Then in the bottom text input area, start a new line with \ char.
3. The browser will freeze

Link to jsFiddle, CodePen, Project etc.:

Further details

The symptom looks to me that there could be an infinite loop triggered in the AlphaTex parser when the input is incomplete.
If I copy/paste a whole chunk of text \track "abc" in a new line, it works fine.

Your environment

Version

• 1.0
• 1.1
• 1.2
• 1.3-alpha.##
• local dev build

Flavor

• JavaScript
• .net

System
Chrome Version 89.0.4389.90 (Official Build) (x86_64)

[Danielku15]

Fixed 😉