Frame is brittle about edwood HOT 4 CLOSED

Frame is scary. 😊 I'll work on this next. But can you describe replica states a little more precisely?

It's not too hard to get Frame to panic so I'll work on making that happen less.

• more unit tests for Frame (which will almost certainly drive some corrections)
• rationalizing Insert
• logging that shows why Frame's gotten sad. In particular, how we ended up getting to this:

panic: frame.Insert pt1 too far

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C libframe isn't particularly robust either. And Edwood's Frame is all of those issues plus whatever translation errors we've added.

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Change cd69e43 clamps the linewraps to the frame.
It looks like much of the instability is caused by pt1.Y values coming back out of bounds from the line wrap, which just blindly adds font height to get the next line. But that spills in many cases, and boom.
Clamping them has dramatically increased stability.

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There's a larger problem with frame that I intend to fix: it assumes in a few places that the frame's rect.Max.Y % FontHeight == 0

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