ENH Add tabindex prop #491

Job	Run time
ci / Context	2s
ci / Generate matrix	16s
ci / Check governance	2s
ci / 8.1 mysql57 endtoend root job1	5m 30s
ci / 8.3 mysql84 phpunit all	6m 26s
ci / 8.2 mariadb phpunit all	4m 33s
ci / 8.3 mysql80 endtoend root job1	6m 41s
ci / 8.1 mysql57 endtoend root job2	10m 10s
ci / 8.1 mysql57 js	5m 0s
ci / 8.3 mysql80 phpunit all	7m 32s
ci / 8.1 prf-low mysql57 phpunit all	5m 20s
ci / 8.1 mysql57 phplinting	2m 16s
ci / 8.3 mysql80 endtoend root job2	10m 57s
ci / 8.1 mysql57 doclinting	3m 28s
ci / Dispatch tag patch release	0s
	1h 8m 13s

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