Clippy shall always show the lint name involved in a diagnostic

[Kannen]

Description

After the first occurrence of a lint, the name of the lint is not displayed anymore.

That is a real annoyance:

• When the diagnostics are shown in a console, one has to find out the first occurrence of the error.
• When the diagnostics are shown in an IDE, there is not such a thing as the first diagnostics so it is almost impossible to find out the name of the lint.

I do not see any good reason to optimize one line of such a useful information. (Or maybe there are still hobbyist using teleprinter and Altair 8800???).

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