Show server error messages in modal dialog to bypass autoclose of main window

[sclu1034]

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Feature request

Which Nextcloud Version are you currently using:
3.15.3

Is your feature request related to a problem? Please describe.
When there is an error, the main dialog allows me to see additional details, such as the error message sent by the server.
However, because the main dialog is built to always close when it loses focus, it's practically impossible to keep that error message visible for context while doing anything else on the machine.

Describe the solution you'd like
Disabling autoclose would be bound to confuse users in one way or another. So I guess the best option would be to make it so that error details are opened as a separate model dialog with the usual window decorations. This one can stay open and be closed manually by the user.

Describe alternatives you've considered

• Copy-and-paste the error message: Cannot select text to copy the message. Instead a weird touch-like gesture to switch tabs happens.