Show a notification on version mismatch

Between the plugin and the Wine plugin host application.

src/plugin/bridges/common.h

@@ -339,6 +339,30 @@ class PluginBridge {
 #endif
     }
 
+    /**
+     * Show a desktop notification if the Wine plugin host is using a different
+     * version of yabridge than this library. Yabridge may still work (and we do
+     * this often during development), but at some point a request may fail the
+     * plugin and the host are out of sync.
+     */
+    void warn_on_version_mismatch(const std::string& host_version) {
+        if (host_version != yabridge_git_version) {
+            generic_logger.log(
+                "WARNING: The host application's version does not match");
+            generic_logger.log(
+                "         this plugin's. If you just updated yabridge, then");
+            generic_logger.log(
+                "         you may need rerun 'yabridgectl sync' first to");
+            generic_logger.log("         update your plugins.");
+
+            send_notification(
+                "Version mismatch",
+                "If you just updated yabridge, then you may need "
+                "to rerun 'yabridgectl sync' first to update your plugins.",
+                true);
+        }
+    }
+
     /**
      * The configuration for this instance of yabridge. Set based on the values
      * from a `yabridge.toml`, if it exists.

src/plugin/bridges/vst3.cpp

@@ -63,7 +63,10 @@ Vst3PluginBridge::Vst3PluginBridge()
 
                     return Ack{};
                 },
-                [&](const WantsConfiguration&) -> WantsConfiguration::Response {
+                [&](const WantsConfiguration& request)
+                    -> WantsConfiguration::Response {
+                    warn_on_version_mismatch(request.host_version);
+
                     return config;
                 },
                 [&](const YaComponentHandler::BeginEdit& request)