Hi there.
I was wondering about the role of this symbol in the dialog title bar. (´・ω・`)What's this?
The 4th one.

I pressed this button in order not to accidentally close the dialog I care about. Yeah, I expected such a feature from this pinned symbol.
However, there was no such function. Pinned dialogs can be easily killed.
Then I came up with the possibility that relocation of it would be prohibited. Unfortunately my next prediction didn't hit either.
So I ask a question. What does this button do?
Anyway I wanted a button to keep the dialog from closing. Is it ideal to have a symbol like a padlock?