Multi-select: try no buffer and lower throttle delay

[ellatrix]

Description

Let's see if this makes multi-select smoother.

[codecov]

Codecov Report

Merging #2935 into master will increase coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #2935      +/-   ##
==========================================
+ Coverage   31.49%   31.51%   +0.01%     
==========================================
  Files         221      221              
  Lines        6309     6305       -4     
  Branches     1122     1120       -2     
==========================================
  Hits         1987     1987              
+ Misses       3632     3630       -2     
+ Partials      690      688       -2

Impacted Files	Coverage Δ
editor/modes/visual-editor/block-list.js	0% <0%> (ø)	⬆️

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[jasmussen]

I can't believe I missed this, sorry about that.

Given other changes we have in the pipeline, including the keyboard stuff, it seems like the pattern to emulate here is that of the real text editor, despite being a multi instance block editor. As such, my initial assessment that we'd want to be careful to invoke multi selection seems squarely wrong on the face of it! Live and learn, right?

Thanks so very much for working on this, and I think we should try and get this in master! 👍 👍

[mcsf]

I've rebased and pushed a little refactor. If you're OK with it,

[ellatrix]

Looks great, let's merge.