Syntax highlighting bug with '()' inside a quote inside a 'case' statement

[friendly-bits]

The code with a problem is:

#!/bin/sh

case a in
    b) echo "wrongcolors(): this breaks highlighting"
esac
echo "this is highlighted incorrectly"
# until the " character is encountered
echo "now highlighting is correct again"

It looks like:

The '()' characters sequence inside a quoted text inside a 'case' statement triggers the issue.