Correct locking on inotify watching, always use updates.

cista/watching.py

@@ -1,6 +1,7 @@
 import asyncio
 import shutil
 import stat
+import sys
 import threading
 import time
 from os import stat_result
@@ -147,11 +148,12 @@ def watcher_thread(loop):
         rootpath = config.config.path
         i = inotify.adapters.InotifyTree(rootpath.as_posix())
         # Initialize the tree from filesystem
-        old, new = state.root, walk()
-        if old != new:
+        new = walk()
         with state.lock:
+            old = state.root
+            if old != new:
                 state.root = new
-                broadcast(format_root(new), loop)
+                broadcast(format_update(old, new), loop)
 
         # The watching is not entirely reliable, so do a full refresh every minute
         refreshdl = time.monotonic() + 60.0
@@ -330,7 +332,7 @@ async def abroadcast(msg):
 
 async def start(app, loop):
     config.load_config()
-    use_inotify = False  # sys.platform == "linux"
+    use_inotify = sys.platform == "linux"
     app.ctx.watcher = threading.Thread(
         target=watcher_thread if use_inotify else watcher_thread_poll,
         args=[loop],