small optimisation, working

MarkdownLivePreview.py

@@ -12,11 +12,13 @@ from .functions import *
 class MarkdownLivePreviewListener(sublime_plugin.EventListener):
 
     def on_modified(self, view):
-        window = view.window()
+        if not is_markdown_view(view):
+            return
+
         vsettings = view.settings()
         if vsettings.get(PREVIEW_ENABLED):
             id = vsettings.get(PREVIEW_ID)
-            preview = get_view_from_id(window, id)
+            preview = get_view_from_id(view.window(), id)
             if id is None or preview is None:
                 preview = create_preview(view)
                 sublime.set_timeout_async(lambda: show_html(view, preview), 1000)

functions.py

@@ -75,6 +75,8 @@ def get_view_content(view):
     return view.substr(sublime.Region(0, view.size()))
 
 def get_view_from_id(window, id):
+    if not isinstance(id, int):
+        return
     for view in window.views():
         if view.id() == id:
             return view

sample.md

@@ -6,6 +6,5 @@ Hope you'll enjoy using MarkdownLivePreview!
 
 ![image](https://forum.sublimetext.com/uploads/st-forum-wide.png)
 
-![GitHub](https://octodex.github.com/images/jetpacktocat.png)
+[GitHub](https://octodex.github.com/images/jetpacktocat.png)
 
-This is a test, and it's still loading.