[kde-guidelines] Proposed addition to the MessageWidget HIG

[Thomas Pfeiffer]

Hi everyone,
a review request [1] where KMessageWidget is used as feedback for a problem in 
a form prompted me to re-think the guideline regarding the ability to manually 
dismiss a message widget. Therefore I propose the following addition to the 
MessageWidget HIG [2]:

Do not allow the user to dismiss a message panel (i.e. do not show a close 
button) if they cannot continue with their workflow until the problem which the 
message panel informs about is fixed.
Example: The user has entered different passwords in a field to set a new 
password and its confirmation field. The dialog cannot be committed in this 
state, so the message panel cannot be closed manually, but only disappears 
when the problem is fixed.

If I hear no objections, I will add this to the HIG tomorrow.
Cheers,
Thomas

[1] https://git.reviewboard.kde.org/r/126523/
[2] https://techbase.kde.org/Projects/Usability/HIG/MessageWidget