Focus text field after clicking `SelectAll` icon button #5483

Job	Run time
Analyze and test code examples (Beta channel, beta, false)	6m 57s
Analyze and test code examples (Stable channel, stable, true)	7m 24s
Validate Firebase configuration	21s
Check if code excerpts are up to date	35s
Build site and check links	2m 22s
	17m 39s

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