Several items missing in iOS 13

[KatieWoe]

For phetsims/qa#427
The icon for the first screen is missing both on the home screen and within the sim on iOS 13. It is there in iOS 12.

[KatieWoe]

Edit: Much larger problem in the sim. The alpha particles don't show up on the second screen, and the close up on the first screen is completely gone.

[KatieWoe]

Occurs in published.

[jessegreenberg]

OK thanks @KatieWoe. It sounds like most of the protons and neutrons are missing. They are painted in an atypical way in this sim. For instance, see RutherfordNucleusNode.RutherfordNucleusIcon which uses inner class IconCanvasNode.

[jessegreenberg]

The particles use CanvasNode and the rendering context method drawImage. Wondering if it is related to those. @KatieWoe can you please try one of these other use cases of this to see if things show up as expected?

• Molecules in the magnifying glass in acid-base-solutions.
• Minus charges in the wall in balloons and static electricity

[KatieWoe]

Molecules in acid-base-solutions look fine to me.
Charges look fine in BASE

[jessegreenberg]

Thanks for checking. Points to either something more specific to the sim or something else entirely.

[jessegreenberg]

This is caused by phetsims/sun#526. Being investigated there.

[jessegreenberg]

This was patched as part of phetsims/sun#526 and can now be closed.