feat: Add batch signal support for contiguous item insertions and removals in EventedList

[tlambert03]

playing with explicit support of batch signals, re #419

[codspeed-hq]

Merging this PR will not alter performance

✅ 67 untouched benchmarks

---

_{Comparing tlambert03:batch-sig (7e94786) with main (cd90d67)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.76%. Comparing base (cd90d67) to head (7e94786).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #422   +/-   ##
=======================================
  Coverage   99.75%   99.76%           
=======================================
  Files          23       23           
  Lines        2461     2520   +59     
=======================================
+ Hits         2455     2514   +59     
  Misses          6        6           

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[ndxmrb]

Good stuff! This makes updates for big amounts of data so much easier. Thank you!

[ndxmrb]

Is there anything in particular you want to add before you merge, or is it ready to go?
The coverage report says the early return is uncovered, but other than that?

To me, it's been a great addition already and using it improves performance significantly. Would love for this to be merged and released 🙂

From the pending EventedModel PR I know your quality standards are very high and there's many things to evaluate beneath the surface. So no pressure, I'm just curious!

[tlambert03]

thanks for the ping @ndxmrb (and sorry again for the delay). I think it's fine. the only thing I'd like opinions on (from you, maybe @Czaki) is whether we like the names of the new signals items_inserting / items_inserted ... or whether we want something like batch_inserting / batch_inserted? anyone have any opinions? Will merge in a couple days if not

[ndxmrb]

Now that you say it, I like batch_inserting / batch_inserted better. To me, that distinguishes the signal for the item (fired every time) from the one for the batch (fired for every contiguous batch) a bit better.

[tlambert03]

yeah i think i do too. will change and merge