Bugfix: Client sometimes does not show up when started by a user

[TheOneRing]

Issue: #7018

[ogoffart]

The code looks good, but is that really the behavior we want?
Opening the settings dialog every time one starts owncloud?

[ogoffart]

But why do we want to show the settings dialog when starting owncloud from the menu?

[TheOneRing]

Well it gives the user a feedback that something happened.
I'd also expect 99% of the users to have it in autostart.

[jnweiger]

Tested on Linux Mint 19

• Double click on the desktop icon always immedately opens the settings windows. Regardless, if the client was previously running or not. OK.
• Starting the client from the command line does not open the settings dialog. OK
• Repeatedly calling the command line client within the first 10 seconds also does nothing. OK
• Calling the client from the commandline after 10 seconds opens the settings menu. OK

logout / login:

• the client does autostart wihtout showing the settings. The tray icon appears. OK
• clicking the desktop icon shortly after the tray icon appears, immediately opens the settings window. OK
• calling the command line client immediately after the tray icon appears does nothing. OK.
• the state of the client at logout (stopped, running, running with settings open) has no impact on the next autostart. OK.

[jnweiger]

Great!