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* Fix Bug #7054: Reuse of $:/core/ui/EditTemplate/fields broken This fixes Bug #7054 by creating a new variable `safeNewFieldValueTiddlerPrefix` that is always set to a valid, temporary prefix. This variable is used within `$action-deletetiddler`. If the passed `newFieldValueTiddlerPrefix` variable is empty a new prefix will be generated by the same logic that creates the original `newFieldValueTiddlerPrefix` variable. To be even more defensive, the prefix-filter was prepended with another prefix filter that limits matches to `$:/temp/NewFieldValue`. This prevents a bogus but non empty value in `newFieldValueTiddlerPrefix` to delete arbitrary tiddlers. * Add a default for `newFieldValueTiddlerPrefix` This fixes a problem that was identified while fixing bug #7054. If the tiddler `$:/core/ui/EditTemplate/fields` is transcluded directly and `newFieldValueTiddlerPrefix` is not set, it will be generated. This makes sure that this value is defined. It can not be redefined unconditionally because if this tiddler is transcluded from `EditTemplate.tid` these two tiddlers must agree on the same prefix because the clean-up is duplicated between `EditTemplate.tid` and `fields.tid`. This would make `safeNewFieldValueTiddlerPrefix` obsolete, but I leave it in there to make the macros safe and prevent any problems if the `newFieldValueTiddlerPrefix` is unset by a later change.