When editing ( especially ) midi, I wish there was one “Hide All except selected” menu entry in the Editor-List > tracks panel.
That would speed up the workflow, to first ‘Hide All’ followed by selecting the 1 track, you would like to see in the arrangement view.
Ideally with the ‘fit selection ( vertical )’ command, so the selected track fills whole arrangement view.
Probably an easy question but a lot of work for the programmers to implement something like this…
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John Devlin made a couple of scripts that do just that.
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Good find! 
(~I just re-categorized that (@johndev’s) post to the Lua Scripting section because I guess I missed it before! O___o)
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Then the question becomes how to quickly and conveniently return to the previous track/bus visibility state… 
-or at least how to quickly return to all tracks/buses being visible again.
I actually don’t know how to do that in a single command. 
(I suppose one could make another Lua Script for this. 
)
-J
Yes, that would be nice. Maybe someone with more Ardour/Lua knwledge can turn this into a toggle operation.
In the mean time, right click on the tracks list gives a ‘show all’.
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Yes, that works.
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As for Lua scripting, seems like you could have two scripts:
1st script:
• Scans all currently visible routes, then…
• Saves a small, external, temporary file with a list of those routes, then…
• Hides all except the selected route.
(• Optionally expands that remaining route to full/larger size; don’t know if possible via Lua.)
2nd script (-a ‘revert view’ script):
• Reads appropriate temp. file and gathers list of previously visible routes.
• Re-shows the routes as required.
…
Seems plausible in theory.
I think this is why the devs gave us the playground of Lua in Ardour.
A lot of customization is possible via scripts, although I’m well aware that the vast majority of potential users of Ardour don’t know anything about coding/scripting (…I didn’t, like a year ago).
-J
It is unfortunate (surprising?) that editor views don’t do that…
https://tracker.ardour.org/view.php?id=6145
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Ha, reported by @x42 himself… O___o
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I also just discovered “Editor Views”, which maybe could help in this regard:
… ah wait, no. This just jumps to a certain “view”/place amongst the tracks, but does not seem to show/reveal currently hidden tracks/buses/groups. Ah well.