[clang-tools-extra] Add support for renaming objc methods, even those with multiple selector pieces (PR #76466)

[David Goldman via cfe-commits]

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@@ -681,12 +718,26 @@ renameOutsideFile(const NamedDecl &RenameDecl, llvm::StringRef MainFilePath,
            ExpBuffer.getError().message());
       continue;
     }
+    std::string RenameIdentifier = RenameDecl.getNameAsString();
+    std::optional<Selector> Selector = std::nullopt;
+    llvm::SmallVector<llvm::StringRef, 8> NewNames;
+    if (const auto *MD = dyn_cast<ObjCMethodDecl>(&RenameDecl)) {
+      if (MD->getSelector().getNumArgs() > 1) {
+        RenameIdentifier = MD->getSelector().getNameForSlot(0).str();
+        Selector = MD->getSelector();
+        NewName.split(NewNames, ":");
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DavidGoldman wrote:

Yep, you can have empty selector fragments.

https://github.com/llvm/llvm-project/pull/76466