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A couple analysis board quirks

First off, the improvements to the analysis board recently are phenomenal. I can't say thanks enough for all the improvements!

I have noticed a couple quirks, although I imagine they'll be simple enough to fix.

First, the regular engine analysis reports scores always from White's perspective, which is fair enough.

The weird thing is that when you are looking at the textual output of multiple lines, threat analysis always reports scores from Black's perspective, which is a bit strange.

I could understand having an option to always present scores from White's perspective, or to always present scores from the perspective of side to move, but this way is odd to me.

A related quirk is that when you're only showing a single line, threat analysis doesn't show you the evaluation of the threat at all.

I imagine a fix for these is fairly easy, but I'm not too worried about it at any rate.

Second, when you go to the analysis board from a game, so that it pulls over the full game into the analysis board, flipping the board erases all added variations and scores.

The same thing doesn't happen if you just open a blank analysis board and add a main line and some variations.

I'm guessing when you go to the analysis board from a played game, it's just reloading the analysis board with the game as a source every time, but that's speculation.

I'm not sure how easy or hard this would be to fix, and at any rate, this one's also not a huge deal.

Thanks again for all your excellent work!

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