fix(plugins): Implement __eq for Channel (#6456)

src/util/WeakPtrHelpers.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <memory>
+
+namespace chatterino {
+
+/// Check if the owner of two weak pointers is equal.
+///
+/// Like `std::weak_ptr::owner_before`, this compares the control blocks,
+/// not the objects themselves.
+/// Equivalent to the C++ 26 `std::weak_ptr::owner_equal`.
+template <typename T>
+bool weakOwnerEquals(const std::weak_ptr<T> &a,
+                     const std::weak_ptr<T> &b) noexcept
+{
+    return !a.owner_before(b) && !b.owner_before(a);
+}
+
+}  // namespace chatterino