Correct locking in thread poll watcher

cista/watching.py

@@ -1,7 +1,6 @@
 import asyncio
 import shutil
 import stat
-import sys
 import threading
 import time
 from os import stat_result
@@ -190,10 +189,10 @@ def watcher_thread_poll(loop):
 
     while not quit:
         rootpath = config.config.path
-        old = state.root
         new = walk()
-        if old != new:
-            with state.lock:
+        with state.lock:
+            old = state.root
+            if old != new:
                 state.root = new
                 broadcast(format_update(old, new), loop)
 
@@ -333,8 +332,9 @@ async def abroadcast(msg):
 
 async def start(app, loop):
     config.load_config()
+    use_inotify = False  # sys.platform == "linux"
     app.ctx.watcher = threading.Thread(
-        target=watcher_thread if sys.platform == "linux" else watcher_thread_poll,
+        target=watcher_thread if use_inotify else watcher_thread_poll,
         args=[loop],
     )
     app.ctx.watcher.start()