I agree with everything you just wrote, Pierre. That was very well stated. What I was disagreeing with is that the mouse pointer’s mere position should define the scope rather than what has actually been selected through use of a control such as mouse or keyboard. My words probably weren’t as clear as they could be. I note that once an image is displayed in the image viewer, there is always something selected in the image browser. Usually one image, but possibly multiple images. I agree, any change to what is selected should be accompanied by a cue or alert. Ordinarily, the image browser wouldn’t be hidden, but since PhotoLab allows that it’s a concern.
I’m also trying to keep in mind what is consistent with the behavior of the Windows OS and what isn’t. Ctrl+A consistently means Select All, so I believe that should be retained as default behavior in the image browser - with the addition of the feedback you are seeking. (I don’t know if Ctrl+A serves any other purpose in PhotoLab.) Perhaps the feedback can even be non-visual, such as a voice saying, “You have selected all images,” if it can be captioned and turned on or off.