fix equality for non root children

[JoviDeCroock]

fixes #3731

We only want to run the state optimization when the invoker is the root of the update, this means that when a parent trickles through to its children it could have altered props which means we can't bail out of eventually consistent states.

We started checking whether we are the root of an update this is easily checked because we shallowly copy the vnode which means our props will be referentially equal at the root of an update

[coveralls]

Coverage remained the same at 99.527% when pulling 6f7dd61 on fix-equality into 2cafede on master.

[github-actions]

Size Change: +30 B (0%)

Total Size: 52.9 kB

Filename	Size	Change
hooks/dist/hooks.js	1.56 kB	+10 B (0%)
hooks/dist/hooks.module.js	1.59 kB	+10 B (0%)
hooks/dist/hooks.umd.js	1.64 kB	+10 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
compat/dist/compat.js	3.78 kB	0 B
compat/dist/compat.module.js	3.72 kB	0 B
compat/dist/compat.umd.js	3.85 kB	0 B
debug/dist/debug.js	3.01 kB	0 B
debug/dist/debug.module.js	3.01 kB	0 B
debug/dist/debug.umd.js	3.09 kB	0 B
devtools/dist/devtools.js	231 B	0 B
devtools/dist/devtools.module.js	239 B	0 B
devtools/dist/devtools.umd.js	314 B	0 B
dist/preact.js	4.02 kB	0 B
dist/preact.min.js	4.05 kB	0 B
dist/preact.min.module.js	4.04 kB	0 B
dist/preact.min.umd.js	4.08 kB	0 B
dist/preact.module.js	4.04 kB	0 B
dist/preact.umd.js	4.09 kB	0 B
jsx-runtime/dist/jsxRuntime.js	358 B	0 B
jsx-runtime/dist/jsxRuntime.module.js	324 B	0 B
jsx-runtime/dist/jsxRuntime.umd.js	439 B	0 B
test-utils/dist/testUtils.js	442 B	0 B
test-utils/dist/testUtils.module.js	444 B	0 B
test-utils/dist/testUtils.umd.js	526 B	0 B

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