Suppress popup "Do you want to save changes ?" / A

[Guest]

When I rotate an image (by pressing SHIFT+R) and doubleclick on the rotated images I jump back to the thumbnails view.
Then I am asked
"Do you want to save changes?"

How can I suppress this popup and auto-save the image ?

Moreover a SECOND popup appears when I click the YES button in the
first popup which asks me

"The file ..... already exists ! Do you want overwrite it ?"

How can I suppress this second popup as well ?

[xnview]

When I rotate an image (by pressing SHIFT+R) and doubleclick on the rotated images I jump back to the thumbnails view.
Then I am asked
"Do you want to save changes?"

How can I suppress this popup and auto-save the image ?

Moreover a SECOND popup appears when I click the YES button in the
first popup which asks me

"The file ..... already exists ! Do you want overwrite it ?"

How can I suppress this second popup as well ?

Yes, a known bug!

[FabioeM]

Am I doing it wrong, or is this problem still actual with XnViewMP?

If "Confirm to save changes to file" is checked, it asks to save picture.
If it's unchecked, it doesn't ask to save, just discard the changes.
How can i set it to automatically save changes without asking anything?