Block "Power Saver" mode while video is playing

fix #106

renderer/index.js

@@ -206,6 +206,9 @@ function dispatch (action, ...args) {
     state.video.isPaused = true
     update()
   }
+  if (action === 'videoPlaying') {
+    ipcRenderer.send('playing-video')
+  }
   if (action === 'videoPaused') {
     ipcRenderer.send('paused-video')
   }

renderer/views/player.js

@@ -36,6 +36,7 @@ function Player (state, dispatch) {
           ondblclick=${() => dispatch('toggleFullScreen')}
           onloadedmetadata=${onLoadedMetadata}
           onended=${onEnded}
+          onplay=${() => dispatch('videoPlaying')}
           onpause=${() => dispatch('videoPaused')}
           autoplay>
         </video>