Add trigger character to SignatureHelpProvider #51731
Description
Problem
Some signature help providers need to know why they are triggered. See microsoft/TypeScript#24915 for more details on one use case
Proposal
Pass the triggerCharacter to the provideSignatureHelp call. This could be introduced in a context parameter at the end of the parameter list:
export interface SignatureHelpContext {
triggerCharacter?: string;
}
export interface SignatureHelpProvider {
provideSignatureHelp(document: TextDocument, position: Position, token: CancellationToken, context: SignatureHelpContext): ProviderResult<SignatureHelp>;
}