How can I avoid the thin line around the images in full preview layout?

In Lighttable with the full preview layout a thin line is added to the image. It seems to be covering the outer pixels of the image as opposed to be a true addition. If I am right about this observation - is it possible to avoid the line being drawn?
It looks nice, but if it covers the outer edge of the image it may cover the edge of a drawn mask not perfectly following the edge of the image. This could be the explanation of a lighter outer edge in one of my images, where I had been less precise with the mask - but didn’t catch it in Lighttable.

I’d have to go and look but its likely just some css for style in the UI… I highly doubt any interaction with a mask drawn in darkroom editing session on the image…

Right, Todd - I don’t imply a technical interaction.
But I wonder if bad house keeping by leaving a drawn mask in some distance from the edge, when it should affect everything all the way to the edge, e.g. leaving a small lighter band, might be covered by the frame - i.e. - hidden by the frame.
If the frame is appended to the image, it will not be able to cover anything - but is it made upon the edge of the image - it might.

I think the Lt previews are just that previews of the processing in DT. I set mine to full preview to see what you were mentioning, and I don’t see it. I have a small one when the mouse hovers over it to show the active image but it disappears if I move the mouse pointer off to the side… otherwise no border… at least for me when I hit f for full screen

When I toggle between Darkroom and the full preview in Lighttable - it’s’ obvious that the frame-line covers the outer pixels of the image, i.e. the frame is not an extension but a change of the image.

Somebody who created this feature must be able to confirm this - and tell us if it can be turned off or not.

It would be nice if you could post screenshots, and some details like operating system, darktable version, screen resolution. If this only affects some images, then details about them (maybe even the image and the sidecar). Right now, I don’t understand what you mean here:

I have never seen what you describe.

Have you tried with a clean config? For example, go to your configuration directory, rename darktablerc to darktablerc.bak, and restart – do you have the problem this way, too?

The question is simply - can we avoid the frame to be drawn in full preview? The frame covers the edge of the image, and I prefer to have the image 100 percent visible. The reasons I tried to explain are unimportant.
If nobody here knows how to avoid the frames being drawn - then I’ll make a suggestion for the developers to make it a choice during the setup.

Are the white lines around the image the ones you are referring to?

Lots of things can be changes via CSS. I don’t know which item in the CSS file defines those lines. The docs you can find here: darktable 4.4 user manual - general.

This is what I thought the OP was talking about… for me they are only active if the mouse pointer is over the image… when I move it away the border goes away

I don’t think so - it’s just either highlighted or not.
I have made a suggestion for a way to select/deselect this feature in the Preferences.

I don’t think there is a chance… preferences is way overloaded already and there is never much enthusiasm to add to it… Are you saying that you have a persistent border?? I certainly don’t so in this case preferences aren’t going to really help ??

AlicVB solved my problem with this CSS:

.dt_fullview #thumb-main:selected #thumb-image
{
  border: none;
}

.dt_fullview #thumb-main:hover #thumb-image
{
  border: none;
}

But be aware that with this css, you will loose the “image hovering” indication…