Consider including bi-directional text controlling characters to specialChars

[nchevobbe]

When reading code, those characters, if not treated as special chars, can make it quite challenging to understand what's going on (e.g. see https://raw.githubusercontent.com/nickboucher/trojan-source/main/JavaScript/stretched-string.js , which is derived from an example in https://trojansource.codes/)

To avoid confusion, I was wondering if the following chars could be put in the default specialChars regex [1]:

• \u202d LEFT-TO-RIGHT OVERRIDE
• \u202e RIGHT-TO-LEFT OVERRIDE
• \u2066 LEFT-TO-RIGHT ISOLATE
• \u2067 RIGHT-TO-LEFT ISOLATE
• \u2069 POP DIRECTIONAL ISOLATE

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[1]

codemirror5/src/edit/options.js

Line 71 in bd1b7d2

option("specialChars", /[\u0000-\u001f\u007f-\u009f\u00ad\u061c\u200b\u200e\u200f\u2028\u2029\ufeff\ufff9-\ufffc]/g, (cm, val, old) => {