Initialize CodeMirror during DOMContentLoaded instead of onload #1894
Description
As per https://github.com/simonw/datasette/pull/1893/files#r1023248927 this should prevent a flash between the textarea being replaced by CodeMirror.
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As per https://github.com/simonw/datasette/pull/1893/files#r1023248927 this should prevent a flash between the textarea being replaced by CodeMirror.