decrease setProgress updates (#833)

src/renderer/lib/state.js

@@ -24,7 +24,11 @@ function getDefaultState () {
      */
     client: null, /* the WebTorrent client */
     server: null, /* local WebTorrent-to-HTTP server */
-    prev: {}, /* used for state diffing in updateElectron() */
+    prev: { /* used for state diffing in updateElectron() */
+      title: null,
+      progress: -1,
+      badge: null
+    },
     location: new LocationHistory(),
     window: {
       bounds: null, /* {x, y, width, height } */

src/renderer/main.js

@@ -157,7 +157,7 @@ function updateElectron () {
     state.prev.title = state.window.title
     ipcRenderer.send('setTitle', state.window.title)
   }
-  if (state.dock.progress !== state.prev.progress) {
+  if (state.dock.progress.toFixed(2) !== state.prev.progress.toFixed(2)) {
     state.prev.progress = state.dock.progress
     ipcRenderer.send('setProgress', state.dock.progress)
   }