Okay this is last time I will try to explain this,
I am trying to say that Paint.NET should not assume my gender or filename extension, I am saying that it should not add Flatten to History Panel instead should do the flattening in the background before saving with an appropriate image format I picked.
Here's what I do: I click Save or Save As (doesn't matter which), when Save Dialog opens and I enter a filename and pick an extension / image format then click Save, it should not add Flatten action in History when I click Save because I will continue to edit my image after getting an export (Save/Save As).
So every time I do Save or Save As and I get a file, after I get back to Paint.NET, I have to undo "Flatten" in History Panel because I don't need it.
I'm not speaking German or Swedish, please understand this time
I repeat what I said in my previous post, this is not about Save dialog assuming file path, file extension, codec, or whatever.
It is about not adding Flatten to History because I undo that Flatten every time I save and it is pretty useless for user because the user will continue to edit the image after getting a temporary/current export of the project/image.