Add selection subtracting for node graph #3290
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Does not close any issue, but I was looking into #2532, a Paper Cut issue that requests parity between the canvas and node graph by adding the lasso select, which has no keybind conflicts. This is my very first PR here, and it was a bit out of my depth.
I wanted to start a bit smaller, and noticed that the node graph could include alt-to-subtract selections without keybind conflicts, because none of the alt keybinds correspond to left clicks on the background!
2025-10-15.16-54-19.mp4
All the other Alt keybinds like Move Duplicate and Preview Node Output still work as expected.