[6.x] Fix element selector modal source validation#18915
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riasvdv merged 3 commits intoMay 19, 2026
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Description
Fixes element selector modal body requests so the
sourcesparameter may be posted as either an array or a string, matching the 5.x behavior where non-array source values were passed through and treated as unrestricted sources. Adds regression coverage for stringsourcesvalues while preserving validation for invalid non-string/non-array payloads.Related issues
Fixes #18913