add focusSendBoxInput method #2196

Job	Run time
Build samples	29s
Build	2m 51s
Unit test	2m 56s
Static code analysis	2m 54s
Type definitions test	3m 19s
Merge test snapshots	5s
HTML test (${{ format('{0}/{1}', matrix.shard-index, matrix.shard-count) }})	-1s
Merge test results	3s
	12m 36s

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