Drawing in a pictureBox on secondary Lua forms doesn't work

[Deakula]

Summary

When a pictureBox is created with the handle of a form that is NOT the oldest form created in the Lua script, and then an attempt is made to draw on said pictureBox, the drawing is unsuccessful. The "oldest" form being the form that was created before all others with the exception of calling forms.destroy() on the oldest form causing the second-oldest form to take its place and so on.

Repro

1. Create two or more forms with calls to forms.newform()
2. Create a pictureBox with forms.pictureBox() for any/all of said forms (at least one of which being a form that is NOT the oldest form created).
3. Attempt to call any draw method (such as forms.drawLine() or forms.drawText()) for any/all of the pictureBoxes.

Output

For each attempt to draw on a pictureBox that does NOT belong to the oldest form, the following is outputted to the Lua console:

Drawing functions can only be used on PictureBox components.

Host env.

• BizHawk 2.9.1; Win11 Home 22H2; Intel/NVIDIA

Screenshots

[YoshiRulz]

I'm guessing no-one (including me) ever tested the linked fix—should be good with 681a576 (though of course I haven't tested that either).