Incorrectly parsed linked in message body

[germain-gg]

Describe the bug

On yesterday's latest test flight

[stefanceriu]

Caused by NSRegularExpression/NSDataDetector not knowing how to deal properly with unicode scalars.

(lldb) po string
"Hello. 🙂 Not sure if you saw https://github.com/vector-im/element-web/issues/24229"

(lldb) po string.count
82

(lldb) po (string as NSString).length
83

(lldb) po range
▿ {0, 83}
  - location : 0
  - length : 83

(lldb) po MatrixEntityRegex.linkRegex.matches(in: string, options: [], range: range)
▿ 1 element
  - 0 : <NSLinkCheckingResult: 0x600003c27720>{30, 53}{https://github.com/vector-im/element-web/issues/24229}

where I changed the range to be NSRange(location: 0, length: (attributedString.string as NSString).length) instead of NSRange(location: 0, length: attributedString.string.count)