LibDevTools: Support highlighting DOM nodes hovered in the inspector

Author: https://github.com/trflynn89
Commit: 6e8d77ff7f
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3666
Reviewed-by: https://github.com/AtkinsSJ

Libraries/LibDevTools/Actors/TabActor.cpp

@@ -7,6 +7,7 @@
 #include <AK/JsonObject.h>
 #include <LibDevTools/Actors/TabActor.h>
 #include <LibDevTools/Actors/WatcherActor.h>
+#include <LibDevTools/DevToolsDelegate.h>
 #include <LibDevTools/DevToolsServer.h>
 
 namespace DevTools {
@@ -22,7 +23,10 @@ TabActor::TabActor(DevToolsServer& devtools, String name, TabDescription descrip
 {
 }
 
-TabActor::~TabActor() = default;
+TabActor::~TabActor()
+{
+    reset_selected_node();
+}
 
 void TabActor::handle_message(StringView type, JsonObject const&)
 {
@@ -69,4 +73,9 @@ JsonObject TabActor::serialize_description() const
     return description;
 }
 
+void TabActor::reset_selected_node()
+{
+    devtools().delegate().clear_highlighted_dom_node(description());
+}
+
 }