bug#62086: 29.0.60; ruby-ts-mode regressions

[Juri Linkov]

> The easiest choice would be to go back to treating only
> braces/brackets/parens are sexp delimiters, but in Ruby, at least, we have
> lots of constructs that are delimited with keywords (such as 'if', 'def',
> 'end'), so that doesn't work. Maybe it'll work better in C/C++, where you
> mostly need to be able to differentiate between different types of angle
> brackets.

Ideally, all previously supported pairs of braces/brackets/parens and
symbols should be navigated with 'C-M-f' plus a very small number
of constructs with "implicit parens" such as do...end, def...end, etc.