[clang-tools-extra] [clangd] Let DefineOutline tweak handle member function templates (PR #112345)

[Nathan Ridge via cfe-commits]

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@@ -130,23 +129,40 @@ getFunctionSourceAfterReplacements(const FunctionDecl *FD,
     return QualifiedFunc.takeError();
 
   std::string TemplatePrefix;
+  auto AddToTemplatePrefixIfApplicable = [&](const Decl *D, bool append) {
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HighCommander4 wrote:

nit: UpperCamelCase for `append`

https://github.com/llvm/llvm-project/pull/112345