Feature Request: Save without additional dialog

[jtrees]

Problem

I always find it quite jarring when I edit an image (e.g. rotate it) then tap "save" and the save dialog pops up.

Proposal

The stock gallery app on my phone provides a much more seamless experience. The image simply gets saved with a filename suffix, preserving the original. I think this kind of behaviour should be mimicked (but with more configurability) in Fossify Gallery.

To keep things flexible, there could be additional options for configuration such as...

1. Replacing the original file on save (Add an option to replace original after edit #62)
2. Using a customizable pattern for the new file name
3. Disabling the "seemless save" feature entirely and sticking with the old dialog flow

... but (except maybe point 3) those probably shouldn't be considered in-scope for the issue at hand and could be implemented separately at a later time.

[jtrees]

Created this issue based on a comment. The GH UI didn't provide me with a template.

Anyway, here's a new one: #227