Implement password policy checker

[nickvergessen]

Fix #3089

[SystemKeeper]

Noticed two things

1. I can't remove a password which was correctly set anymore (GUI reflects a removed password):

ScreenCaptureProject32.mp4

2. When the password validation fails, the GUI still reflects a successful change:

ScreenCaptureProject33.mp4

[SystemKeeper]

3. Conversation is still created, although an error occured:

ScreenCaptureProject34.mp4

[nickvergessen]

Yeah noticed too that there are many issues with the field.
Also when you open the settings and the conversation has a password already, the input is not visible 🙈

[nickvergessen]

Conversation is still created, although an error occured:

That is actually a sad issue, as we currently set the password after the creation. Basically boils down to:
#2874

[SystemKeeper]

Oh I see. Then this problem is out of scope for this PR and currently expected.

[nickvergessen]

Or we use this moment to implement it

[vitormattos]

Only need fix cs

[nickvergessen]

Also when you open the settings and the conversation has a password already, the input is not visible 🙈

@marcoambrosini maybe you can help with the missing input field?

[SystemKeeper]

Haven’t tested, but isn’t there special handling for removing the password (eg setting the password to „“) needed?

[nickvergessen]

I had wrapped the event dispatch in an if checking for non empty string.... But seems it got removed by a rebase or something

[nickvergessen]

Haven’t tested, but isn’t there special handling for removing the password (eg setting the password to „“) needed?

Fixed now