Cache IAudioProcessor::canProcessSampleSize()

src/plugin/bridges/vst3-impls/plugin-proxy.h

@@ -531,6 +531,11 @@ class Vst3PluginProxyImpl : public Vst3PluginProxy {
      * @see function_result_cache
      */
     struct FunctionResultCache {
+        /**
+         * Memoizes `IAudioProcessor::canProcessSampleSize()`, since some hosts
+         * call this every processing cycle.
+         */
+        std::map<int32, tresult> can_process_sample_size;
         /**
          * Memoizes `IEditController::getParameterCount()`.
          */