Ok, you would basically like a config option to disable the "Resize to capture", should be doable.

What would you do for the first capture? What size would you use for the initial size?

Actual, I prefer to just leave it as I set it in the beginning (e.g. very small, but not hidden). No resizing at all if disabled. I often use the Shift-L feature on some presentation window somewhere else. If this is 1920x1080 image, a "resize to capture" would bring ksnip into the foreground as way to large.

@DamirPorobic
Should we place a default window size and an option to disable automatically resizing after capture ?

Once the first capture is made we can switch to this 'default size' and when subsequent captures are made, they will not change the window size.
This means that if, after the first capture, the user resizes the window, the next captures will not resize to the default size; the default size only applies to the first capture.

@fnkabit yeah, I had something like that in mind.

Check if you can extract the resize logic in a separate class. You can pass the an interface that it implemented by MainWindow into that class that allow you to resize. Don't forget tests for that class.

@pkoerner81929 can you have a look at the functionality that @fnkabit has implemented?