Custom cursor image is hard to use #508
Description
When trying to move/copy subtree (as per manual), program changes cursor shape into a custom image of a game tree
Problem is that cursor's active region (that must intersect game node for targetting to work) is in unintuitive location - it's in the middle right of the image (somewhere in between top 2 green branches)
Problem is especially noticeable when a miss (mouse release) causes the default system's cursor to return, making it obvious that custom cursor is shifted to the side by a lot
Suggestion: either change the image, shift active region to the visible tip of the tree (root or one of the corners), or at least shift the cursor so that active region coincides with standard arrow cursor's