open view in current window not in new one

MarkdownLivePreview.py

@@ -72,19 +72,24 @@ class OpenMarkdownPreviewCommand(sublime_plugin.TextCommand):
 
         syntax_file = original_view.settings().get("syntax")
 
-        if file_name:
-            original_view.close()
-        else:
-            # the file isn't saved, we need to restore the content manually
+        # don't close the original view; keep it in your main window:
+        # if file_name:
+        #     original_view.close()
+        # else:
+        #     # the file isn't saved, we need to restore the content manually
+        #     total_region = sublime.Region(0, original_view.size())
+        #     content = original_view.substr(total_region)
+        #     original_view.erase(edit, total_region)
+        #     original_view.close()
+        #     # FIXME: save the document to a temporary file, so that if we crash,
+        #     #        the user doesn't lose what he wrote
+        if not file_name:
+            # If the file isn't saved, we still need the content for the new view
             total_region = sublime.Region(0, original_view.size())
             content = original_view.substr(total_region)
-            original_view.erase(edit, total_region)
-            original_view.close()
-            # FIXME: save the document to a temporary file, so that if we crash,
-            #        the user doesn't lose what he wrote
 
-        sublime.run_command("new_window")
-        preview_window = sublime.active_window()
+        # instead of making a new window, grab your existing one:
+        preview_window = original_view.window()
 
         preview_window.run_command(
             "set_layout",
@@ -172,7 +177,8 @@ class MarkdownLivePreviewListener(sublime_plugin.EventListener):
         if markdown_view.id() in self.phantom_sets:
             del self.phantom_sets[markdown_view.id()]
 
-        self.preview_window.run_command("close_window")
+        # don’t close the entire window—just let the user close the preview tab:
+        # self.preview_window.run_command("close_window")
 
         # find the window with the right id
         original_window = next(