fix: seek doesn't work before video finished loading (#94)

Solve FEC-9316.
unlisten of loaded_data wasn't always earlier enough, fix with check for seeked so don't seek after loaded_data

src/dash-adapter.js

@@ -453,6 +453,7 @@ export default class DashAdapter extends BaseMediaSourceAdapter {
       }
       this._init();
       const _seekAfterDetach = () => {
+        if (isNaN(this._lastTimeDetach)) return;
         if (parseInt(this._lastTimeDetach) === parseInt(this.duration)) {
           this.currentTime = 0;
         } else {
@@ -462,9 +463,8 @@ export default class DashAdapter extends BaseMediaSourceAdapter {
       };
       if (!isNaN(this._lastTimeDetach)) {
         this._eventManager.listenOnce(this._videoElement, EventType.LOADED_DATA, _seekAfterDetach);
-        this._eventManager.listenOnce(this._videoElement, EventType.SEEKED, () =>
-          this._eventManager.unlisten(this._videoElement, EventType.LOADED_DATA, _seekAfterDetach)
-        );
+        //change to NaN to avoid the seek after detach whenever seeked fired before - SmartTV issue
+        this._eventManager.listenOnce(this._videoElement, EventType.SEEKED, () => (this._lastTimeDetach = NaN));
       }
     }
   }