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In https://forum.bricsys.com/discussion/comment/38840/#Comment_38840, Hans De Backer said:
"since V19, pressing Shift+Tab during PushPull will select the furthest face in your solid that is parallel to the face being pushpulled, to become the reference face to measure the distance from.
In solids with a simple geometry, like a box, this is 'the face at the opposite side'.
Also new in V19, to select any other (parallel) face in the model to become the reference face during pushpull, hover the face with the cursor and press Tab."
Great. I went looking for something similar with 2D Stretch - to say re-size a rectangle to a specific new length, rather than stretching it by a typed distance. Undocumented AFAICS.
Conversely, when grip-editing say a line by a typed distance, to have it stretch by that distance rather than it re-sizing to that as new length.
Can't find a key combination which switches the reference end like that. Is there?