Marc Jauvin 864816f7f2 Make CMS object code editor read-only in safe mode (#4769)
Adds a dismissable message to the CMS object code editor indicating that the PHP code section of a CMS object cannot be edited when `cms.enableSafeMode` is `true` (or when debugging is disabled if `null`).

Credit to @mjauvin.
2019-12-09 21:05:50 +08:00
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