Fix #357: TextNode: render text when dimensions are specified

[romgrk]

A few questions:

• Should the fixed text be cropped to its dimensions?
• Should I add a test for this? If so, how?

[bryphe]

This looks great, @romgrk ! Thanks for fixing this - I like the way you refactored the code 👍

Regarding your questions:

Should the fixed text be cropped to its dimensions?

I think the behavior you show in your screenshot is reasonable - especially since @Akin909 implemented text overflow in #392 , and we have the ability to add overflow(Hidden) on the parent.

Should I add a test for this? If so, how?

Really appreciate you thinking about this! 💯 Unfortunately there is a blocking bug on our CI machine - i tracked in #400 - the Azure CI environments don't support creating an OpenGL context (at the moment). Since the test would need to touch the draw method, which makes OpenGL calls, testing that portion of the stack isn't doable until we get #400 sorted out. But I think what you have right now is reasonable.

I'll bring in this as it looks good overall - thanks for the help, @romgrk ! Really appreciate the contribution.