edit/lock

Prints a stronger warning message (can be unlocked however), when it
detects that someone wants to edit a page someone else is already
working at.

prev << "edit/lock"
next >> "edit/spellcheck/"

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You cannot modify the README.plugins file, but anyhow any ideas or suggestion should as usually get filed on BugReports, UserSuggestions or even better the README.plugins.Discussion.