Meta scope not applied to ~ content when branching

[eugenesvk]

main        	: (~test   )*	;
test {#[ZO]}	: '"' ~ '"' ; # scope applied
test {#[ZO]}	: '"' ~ '"' | '"'{#[Z]}; # branching, scope NOT applied to the content
test {#[ZO]}	: '"' '[^"]*"' | '"'{#[Z]}; # branching without ~, scope applied