Fix TextEdit HScroll hiding after wrapping

[kitbdev]

• fixes Horizontal scroll disappears after toggling autowrap #84812

Since it only happens in certain scenarios here is more information and reproduction steps:

Reproduction:

1. Make a new default script.
2. Change the TextEdit width such that the word previous will be wrapped but not the word time. from the comments on lines 9 and 4.
3. Toggle word wrap on and off (alt+z).
4. The hscrollbar doesn't reappear like it should.

When disabling word wrap, the longest line while wrapped (line 4) doesn't change size so TextEdit::Text::_calculate_line_height() exits early, even though there is a new longest line.

This happens because TextEdit::Text::_calculate_max_line_width() was assuming it was being called from TextEdit::Text::invalidate_cache() only and that lines had only shrunk, but this is not true since it can be called from TextEdit::Text::invalidate_all_lines() and other places.
This also applies to TextEdit::Text::_calculate_line_height() since it is the same situation.

[Paulb23]

Rather then removing this optimisation for invalidate_cache would it be better to set the force-ably set the width/height to -1 under these specific scenarios?

[kitbdev]

I'll set it to -1 where it's called instead of removing the optimizations.
Not sure if its needed for line width since there is probably a low chance of another line being the same width, but it is good for line height.

[akien-mga]

Thanks!