Simplify deleting a low value chain, CTRL-z style (advanced)

[johnwdubois]

Goal

• "Accidental" Trails (e.g. a Trail with just one Track in it, that the user just made) should be very easy to delete, without any confirmation dialog.
• The same goal is relevant for all chains (Trail, Resonance, Stack, Clique)

What to do (quick)

• The desired behavior already seems to exist for the ESC key (just try it).
• Let the DEL key just copy the ESC key behavior?

What to do (fancy)

1. When any new Trail is created, set LowValueChain = TRUE.
2. Change LowValueChain to FALSE whenever...

• a 2nd Track is added to the Trail (i.e. Trail has ever had more than 1 Track in it)
• a tag is added (i.e. if the Trail, or any of its Tracks, has ever had any tags attached to it)

3. If a Trail has LowValueChain = TRUE, let the user delete it immediately, without confirmation, just by pressing any of the following...

• "Delete" key
• "Esc" key
• "CTRL-z"

4. Do the same for low value (e.g. "accidental")...

• Resonance chains
• Stacks
• Cliques?

See also
Simplify the warning for deleting any Trail #1465

Fancy

1. If a deletion warning must be shown, make clear what it applies to. Do not let the warning dialog box be drawn on top of the trail being referenced, where the user cannot see what it being deleted. Instead:

• show the warning directly below the most recently clicked Track token in the Trail
• if there is no room below the Track token, show the warning directly above it
• alternatively, show it to left or right

Screenshot
This shows the current alert, which is both verbose and unclear (because it covers up the relevant Track/Trail).