Prerequisites

• I have written a descriptive issue title.
• I have searched all issues to ensure it has not already been reported.

Summary

Today, available method/constructor overloads are shown when you get to the method body or an open parens
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However, if you are already in a closed parens and want to see the available method/constructor overloads, this is not available, you have to delete the closed parens and retype them to get the prompt again.

Proposed Design

The C# extension wires up to Trigger Parameter Hints when in the method/constructor parameter body, we should do the same.
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