Fix worker restart.

cista-front/src/components/UploadButton.vue

@@ -159,17 +159,18 @@ const worker = async () => {
       upqueue.shift()
       continue
     }
-    // Note: files may get modified while we're uploading, f is ours
     const start = f.cloudPos
     const end = Math.min(f.size, start + (1<<20))
     const control = { name: f.cloudName, size: f.size, start, end }
     const data = f.slice(start, end)
+    f.cloudPos = end
+    // Note: files may get modified during I/O
     ws.sendMsg(control)
     await ws.sendData(data)
-    f.cloudPos = end
   }
   if (upqueue.length) startWorker()
   uprogress.status = "idle"
+  workerRunning = false
 }
 let workerRunning: any = false
 const startWorker = () => {