forward_find_char

Advances this, calling pred on each character.

If pred returns true, returns true and stops scanning. If pred never returns true, this is set to limit if limit is non-null, otherwise to the end iterator.

Parameters:

this	a TextIter
pred	a function to be called on each character
limit	search limit, or null for none
user_data	user data for pred

Returns:

whether a match was found