[bug]Fast playout to the end exception

[xiaoyifang]

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I have a bug report

Steps:
1, press Fast playout to the end
2, while the node is still generating ,right click the new added node and choose ,expand .
3, error throw.

ERROR: Exception KeyError: SGFNode({'W': ['bm']})
  File "kivy\_clock.pyx", line 649, in kivy._clock.CyClockBase._process_events
  File "kivy\_clock.pyx", line 218, in kivy._clock.ClockEvent.tick
  File "G:\katrain\katrain\gui\widgets\movetree.py", line 228, in <lambda>
    lambda _dt: self.move_tree_canvas.draw_move_tree(self.current_node, self.insert_node), 0.1
  File "G:\katrain\katrain\gui\widgets\movetree.py", line 157, in draw_move_tree
    x = self.move_pos[parent][0] + 1

open the generated sgf file also can trigger this exception.

KaTrain_韩一洲 五段 vs Master play to the end.zip

I guess the action I took has damaged the sgf file in some way.

This can be reproduced with other sgf files.

[sanderland]

Confirmed, though I haven't figured out why yet.

[sanderland]

Hopefully resolved with 32b3ad9
Still not 100% sure what is causing it, probably the rapid removal/adding of shortcuts in fast playouts

[xiaoyifang]

I noticed that:
If modify the sgf manually and removed all the KTSID node

,it can also work normally.