HackStudio: Moved code closing project from open_project to own method

Take the code which closes the current project out of open_project
method and move it into its own method.

Userland/DevTools/HackStudio/HackStudioWidget.cpp

@@ -194,16 +194,7 @@ void HackStudioWidget::open_project(const String& root_path)
         exit(1);
     }
     if (m_project) {
-        m_editors_splitter->remove_all_children();
-        m_all_editor_wrappers.clear();
-        m_open_files.clear();
-        m_open_files_vector.clear();
-        add_new_editor(*m_editors_splitter);
-        m_find_in_files_widget->reset();
-        m_todo_entries_widget->clear();
-        m_terminal_wrapper->clear_including_history();
-        stop_debugger_if_running();
-        update_gml_preview();
+        close_current_project();
     }
     m_project = Project::open_with_root_path(root_path);
     VERIFY(m_project);
@@ -1169,6 +1160,20 @@ void HackStudioWidget::stop_debugger_if_running()
     }
 }
 
+void HackStudioWidget::close_current_project()
+{
+    m_editors_splitter->remove_all_children();
+    m_all_editor_wrappers.clear();
+    m_open_files.clear();
+    m_open_files_vector.clear();
+    add_new_editor(*m_editors_splitter);
+    m_find_in_files_widget->reset();
+    m_todo_entries_widget->clear();
+    m_terminal_wrapper->clear_including_history();
+    stop_debugger_if_running();
+    update_gml_preview();
+}
+
 HackStudioWidget::~HackStudioWidget()
 {
     stop_debugger_if_running();

Userland/DevTools/HackStudio/HackStudioWidget.h

@@ -104,6 +104,7 @@ private:
 
     void handle_external_file_deletion(const String& filepath);
     void stop_debugger_if_running();
+    void close_current_project();
 
     void create_open_files_view(GUI::Widget& parent);
     void create_toolbar(GUI::Widget& parent);