Currently, removing a node frame a frame is rather annoying. The `alt+P`
shortcut is hard to reach and probably not very intuitive. Furthermore, often
one only notices that one wants to remove a node from a frame after starting to
move the node. So one would have to put the node back down, detach it from the
frame and then start moving again.
This patch simplifies this entire process by adding a new shortcut that can be
used while dragging nodes. When `F` is pressed, the selected nodes are detached
from their parents. Alternatively, if the nodes are detached already, they may
be attached to the frame under the cursor.
Pull Request: https://projects.blender.org/blender/blender/pulls/138650
578f935170