Shell script syntax highlighting fails with indented EOT HereDoc

[alexr00]

The code with a problem is:

#!/bin/sh
foo=$(cat <<'    EOT'
        A HereDoc
    EOT
)
echo "$foo"

It looks like:

The scopes at the beginning of the EOT line include this no-indent scope:

string.quoted.heredoc.no-indent.EOT
meta.argument.shell
meta.statement.command.shell
meta.statement.shell
meta.scope.subshell
meta.expression.assignment.shell
source.shell

It should look like:

Originally from @sandy-fairsupply in microsoft/vscode#223443

[sandy-fairsupply]

Small correction:

It should look like:

Note that the closing EOT marker is preceded by four spaces to match the opening marker.

[RedCMD]

should be easy fix
either place \\s* before \\3 or capture the [ \\t]*+ and replace \\3 with \\3?\\4