I was trying out the new combinators last night, and found one thing that was rather fiddly. When trying to send a signal lights and pumps, I could not see in the tooltip what signals were being input to them. I could see the signal being output when hovering over the nearest power pole or combinator, but this required a lot of fiddly back and forth checking.
Therefore, my suggestion is as follows:
1) When mouse is hovering over a listener (e.g. lights and pumps), show what signal is being received to the tips on the right pane.
2) When viewing the rule for a listener, show the signal being received. Related to #1 because the tips in the right pane disappear when a rule window is open.
I believe this is useful in the case when a light or pump is triggered by x > y. It is useful to see what x is when accessing the rule.
edit:
I have discussed a specific implementation of my suggestion however, the end goal of this suggestion is to have the signal data on screen when looking at a listener or defining a rule. There are probably several ways to implement that
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