[Bug] App's download gets cancled s soon the user leaves app's sheet

[machiav3lli]

Steps to reproduce:

1. Open an app info sheet (that has an update)

2. Press update -> download starts with an indicator in place of download button (with no notification)

3. Press back to main activity

4. Open the app's info sheet again: no indicator that the download is running (and it's not running anyway)

Expected behaviour to the mentioned steps

2. Download starts with a notification.

3. Download doesn't get canceled.

4. There's an indicator of the download progress in place of the download button.

[Tanzin01]

Alike issue. I can't leave the app page after clicking download. I have to stay in that app page till the app is downloaded.