RFC: Moving KWallet Password dialog into Plasma

[Martin Gräßlin]

Hi all,

the problems around review request #105628 and getting KWallet's Password 
dialog properly raised above the window it is asking the password for just 
triggered a thought process.

The main problem here is that $service ask for a password through 
$otherservice. This utterly fails because the $service is not linked directly 
to a window which the window manager would need to properly stack the window.

Now if we think about it in most cases $service is actually a "system" service 
which can be considered belonging to the workspace. E.g. checking for mail, 
logging into your telepathy account and so on.

Providing a password safe and asking for the master password is also a 
"system" service and should belong into the workspace.

So here my idea: let's move the password dialog into the desktop shell. Have 
it as a so-called "persistent" notification popping out of the panel and be 
shown on top of all other windows till the user either dismisses it or enters 
the password.

I think this would solve most of our current issues. There would be one place 
where the dialog is shown to ask for the password, it is visually clear that 
it's a system service which asks for the password and not some random malware 
and if several applications want to open the wallet this problem is also 
nicely solved by e.g. saying "Mail Dispatcher Agent and Telepathy need to 
unlock the wallet".

So what do you think?

Best Regards
Martin Gräßlin
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