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refactor: improve Given search preference warning #22189

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Fixes #22153
Ref https://scala-lang.org/2024/08/19/given-priority-change-3.7.html

Problem

It wasn't clear what action users was suppose to take to suppress the new-from-3.6 Given search preference warning.

Solution

  1. This refactors the code to give the warning an error code E205.
  2. In case of warnings, tell the user to choose -source 3.5 vs 3.7, or use nowarn annotation.

**Problem**
It wasn't clear what action users was suppose to take to suppress
the new-from-3.6 Given search preference warning.

**Solution**
1. This refactors the code to give the warning an error code E205.
2. In case of warnings, tell the user to choose -source 3.5 vs 3.7,
   or use nowarn annotation.
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@OndrejSpanel OndrejSpanel left a comment

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I agree. Make the warning describe what action is to be taken to make it actionable.

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Unactionable warning: "Given search preference for ... will change."
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