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Original file deleted as updated version available lower down the page.

Have you seen View -> Rulers in the IDE?

Have you seen View -> Rulers in the IDE?

But, on clicking I get nothing in either 7.1.4 or 8.1 on Xubuntu.

It was slightly fiddly on Ubuntu at first for me, almost like it needed to be kickstarted to get going. Definitely needs a toplevel stack to be opened, and I find the rulers were reliably present when I had at least one control on the card in that stack. Not yet sure if a bug or a feature; can't say I use the rulers often.

Yes, you are right, rulers only show up when there is a stack open because they are "local" rulers
linked to the stack; and if one has 2 stacks open the ruler ONLY is of any use for the top stack.

I much prefer my Rulers because they are independent of individual stacks so can be used for
comparison between stacks: they are global.
Why did Richmond take a ruler to bed with him?

To see how long he slept.

Why did Richmond carry a ruler with him?

In case it reigned.

Here's a variant with grab handles.

Updated version with arrows for repositioning.