[clang-tools-extra] [clangd] Support outgoing calls in call hierarchy (PR #77556)

[Igor V. Kovalenko via cfe-commits]

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@@ -1700,6 +1700,7 @@ declToHierarchyItem(const NamedDecl &ND, llvm::StringRef TUPath) {
 
   HierarchyItem HI;
   HI.name = printName(Ctx, ND);
+  // FIXME: Populate HI.detail the way we do in symbolToHierarchyItem?
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i-garrison wrote:

I see. Ideally there should be some recommended use model for `c++` which call hierarchy clients/visualisers (e.g. lsp4e) could implement to show expected function signatures. Like "obtain details field from call hierarchy item and use it as function signature" and then lsp4e could append details to name. We probably can later tune xrefs.cpp implementation to provide required details where needed. Note that function return value is still not available, and as far as I can see there is no place in protocol to put it in.

https://github.com/llvm/llvm-project/pull/77556