Fixed :grouped_options of select_tag. #1337
Merged
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Reference to issue #1294.
When using content_tag and other tag helpers in template of erb or slim,
__erb_in_template
is always defined.So, I thought that concat_content(output) is executed in #content_tag, against my own will.
This pull request is way of solving without using block in #grouped_options_for_select.