When moving node(s):

* Ctrl + drag nodes: restrict movement to horizontal or vertical * Ctrl + Alt + drag nodes: restrict movement to the directions of the control handles and their perpendiculars

When moving a control handle of a node:

* Ctrl + drag: snap the handle's angle to 15 degrees steps plus the original angle and its perpendiculars * Shift + drag: rotate the other handle by the same angle * Alt + drag: lock the length of the handle

Note: Ctrl, Shift, Alt can be combined when dragging handles.

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