fix: Fix automatic sort of Composite items in fixed containers

[EricRibeiro]

Closes #46

How to test?

Does this PR introduce breaking changes?

No

[codesandbox-ci]

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Sandbox	Source
Reakit	Configuration
xenodochial-wildflower-dcuvh	Issue #46

[RonanFelipe]

Thanks for working on this @EricRibeiro! I'll take a look at it this weekend (hopefully).

[github-actions]

Size Change: 0 B

Total Size: 257 kB

ℹ️ View Unchanged

Filename	Size	Change
packages/reakit-playground/dist/reakit-playground.min.js	187 kB	0 B
packages/reakit-system-bootstrap/dist/reakit-system-bootstrap.min.js	19.1 kB	0 B
packages/reakit-system-palette/dist/reakit-system-palette.min.js	8.85 kB	0 B
packages/reakit-system/dist/reakit-system.min.js	2.45 kB	0 B
packages/reakit-utils/dist/reakit-utils.min.js	3.46 kB	0 B
packages/reakit/dist/reakit.min.js	36 kB	0 B

_{compressed-size-action}

[mairieli]

I'm also hitting this issue on a regular basis, it can be quite jarring on a long page – thanks for taking on the fix!

[codecov]

Codecov Report

Merging #47 (1fb2103) into master (c1fa3dc) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 1fb2103 differs from pull request most recent head 75dd95b. Consider uploading reports for the commit 75dd95b to get more accurate results

@@           Coverage Diff           @@
##           master      #47   +/-   ##
=======================================
  Coverage   95.12%   95.12%           
=======================================
  Files         230      230           
  Lines        3509     3509           
  Branches      955      955           
=======================================
  Hits         3338     3338           
  Misses        170      170           
  Partials        1        1           

Impacted Files	Coverage Δ
...src/Composite/__utils/useSortBasedOnDOMPosition.ts	54.54% <100.00%> (ø)

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[RonanFelipe]

What is the reasoning behind the mutate name?