feat: /clearmessages command (#2485)

src/controllers/commands/CommandController.cpp

@@ -22,6 +22,7 @@
 #include "util/Twitch.hpp"
 #include "widgets/Window.hpp"
 #include "widgets/dialogs/UserInfoPopup.hpp"
+#include "widgets/splits/Split.hpp"
 
 #include <QApplication>
 #include <QFile>
@@ -633,6 +634,16 @@ void CommandController::initialize(Settings &, Paths &paths)
 
             return "";
         });
+
+    this->registerCommand("/clearmessages", [](const auto & /*words*/,
+                                               ChannelPtr channel) {
+        auto *currentPage = dynamic_cast<SplitContainer *>(
+            getApp()->windows->getMainWindow().getNotebook().getSelectedPage());
+
+        currentPage->getSelectedSplit()->getChannelView().clearMessages();
+
+        return "";
+    });
 }
 
 void CommandController::save()