fix(synthetic-shadow): shadow semantics for tabindex

[ekashida]

This reverts commit 040c22a.

Details

Implements shadow semantics for tabindex.

Does this PR introduce a breaking change?

No

[salesforce-best-lwc-internal]

Benchmark results

Base commit: 34dd4b9 | Target commit: 0a2c57b

lwc-engine-benchmark

table-append-1k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table/append/1k	duration	140.90 (±2.45 ms)	139.55 (±4.80 ms)	-1.3ms (1.0%) 👍

table-clear-1k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table/clear/1k	duration	10.65 (±0.85 ms)	10.20 (±0.90 ms)	-0.4ms (4.2%) 👌

table-create-10k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table/create/10k	duration	859.10 (±7.40 ms)	854.90 (±6.45 ms)	-4.2ms (0.5%) 👍

table-create-1k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table/create/1k	duration	108.40 (±2.90 ms)	106.50 (±2.80 ms)	-1.9ms (1.8%) 👍

table-update-10th-1k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table/update-10th/1k	duration	68.00 (±2.05 ms)	74.75 (±3.60 ms)	+6.8ms (9.9%) 👎

tablecmp-append-1k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table-component/append/1k	duration	223.90 (±7.45 ms)	214.60 (±13.90 ms)	-9.3ms (4.2%) 👍

tablecmp-clear-1k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table-component/clear/1k	duration	6.70 (±1.25 ms)	6.55 (±1.20 ms)	-0.1ms (2.2%) 👌

tablecmp-create-10k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table-component/create/10k	duration	1621.90 (±11.20 ms)	1593.40 (±12.90 ms)	-28.5ms (1.8%) 👍

tablecmp-create-1k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table-component/create/1k	duration	181.95 (±3.60 ms)	181.35 (±4.95 ms)	-0.6ms (0.3%) 👌

tablecmp-update-10th-1k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table-component/update-10th/1k	duration	65.20 (±5.00 ms)	66.75 (±5.10 ms)	+1.5ms (2.4%) 👌

wc-append-1k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table-wc/append/1k	duration	234.05 (±12.45 ms)	235.85 (±12.25 ms)	+1.8ms (0.8%) 👌

wc-clear-1k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table-wc/clear/1k	duration	11.60 (±1.80 ms)	12.05 (±1.60 ms)	+0.5ms (3.9%) 👌

wc-create-10k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table-wc/create/10k	duration	1790.10 (±9.00 ms)	1749.60 (±12.30 ms)	-40.5ms (2.3%) 👍

wc-create-1k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table-wc/create/1k	duration	196.65 (±5.60 ms)	198.25 (±4.05 ms)	+1.6ms (0.8%) 👌

wc-update-10th-1k	metric	base(34dd4b9)	target(0a2c57b)	trend
benchmark-table-wc/update-10th/1k	duration	66.35 (±5.70 ms)	65.35 (±4.35 ms)	-1.0ms (1.5%) 👌