Game allows initial checking inconsistently about area-model-algebra HOT 6 CLOSED

@jonathanolson I think the "buggy" state is reached completely based on the type of preceding challenge. I collected some "data" over multiple level runs and it looks like if these "Find the total area" challenges are preceded by a challenge involving a quadratic equation, we get the bug. I can give more detail if that's not enough information, it's just hard to articulate my hunch.

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definitely a bug. I think the button is supposed to be gray until you adjust at least one number picker.

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FYI @samreid I'm working on cleaning up a lot of the code related to this, as it was particularly messy with bad logic.

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Implemented fixes. @BryceAG can you verify?

@amanda-phet, should we disable the check button when there is 1 or more "error" entries?

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Button logic is looking correct. @amanda-phet see the question immediately above.

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should we disable the check button when there is 1 or more "error" entries?

That seems consistent with the flow before submitting an incorrect answer, but I'm fine leaving this as it is.

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