When removing node from the non-current tree, info dialog is wrong about tree.

[jkanev]

When removing a node from a tree, and that tree is not the currently open tree, the warning message warns about the node being removed from the current tree. Steps:

1. Open a file with multiple trees A, B, C, ..., N.
2. Open tree A.
3. Select a node that is in both A and B. Remove the node from B by clicking the tree field for B at the top, in the menu select "Remove from Tree".

→ Expected: Warning dialog says "You are removing a node from tree B". → Observed: Warning dialog says "You are removing a node from tree A".

Note: This behaviour is the same if you use the "Remove from Tree" button in the toolbox on the left.