[Form] Fixed bug that incorrectly causes the "required" attribute to be omitted from select even though it contains the "multiple" attribute
Merge remote-tracking branch 'upstream/2.4' into fix-select-required
- Fixed issue in the PHP template
- Updated unit tests (also added the "required" attribute to make it more obvious that the form is required)
Merge remote-tracking branch 'origin/fix_select-required-attribute' into 2.4