Double check code, sim is not operable with mouse after some mixed input interaction

[terracoda]

After last commit, in #440 the Preferences menu button can become unclickable and not operable via the keyboard after a little bit of interaction.

[terracoda]

This might be resolved when #440 and related issues #381, #441 are all implemented?

[terracoda]

Actually, it's more than just the Preferences button. The sim is inoperable with a mouse, unless my hardware is the issue.

[terracoda]

Updating, after last commit, the sim can become inoperable with a mouse. It appears to work fine with the keyboard, but I think I did notice at least once that the Preferences button was not operable vi the keyboard after interaction.

[terracoda]

A reset does not fix the problem.

[zepumph]

When you encounter this problem, have you looked in the console? Is there an error? Make sure you are running with assertions enabled &ea and see if anything is in the console. I cannot reproduce from some fiddling with keyboard/mouse input combinations.

[zepumph]

I'm not sure about this, but if you find you're getting this assertion:

Assertion failed: focusable Nodes do not support DAG, and should be connected with an instance if focused.

Then I have reproduced this problem, and it will be fixed in #440.

[terracoda]

Checked console, but will check again next time it happens.

[terracoda]

This mystery issue is not happening anymore. Closing.