P: photo edit slider thumb jumps on click (web version)

[comunicazione.orp]

1) Click and hold a slider thumb under photo editing, for example in the "Light" or "Color" area, without moving or sliding the mouse

Expected behaviour

The thumb (the round button to control values by dragging along the track) should stay in it's initial position, wherever on the thumb the user clicks.

Actual behaviour

The thumb automatically jumps over to the right, suddenly changing the slider value.

This is unexpected behaviour, it should stay put until the mouse cursor moves, and then follow the mouse cursor position in the horizontal movements.

I'm guessing that in the underlying UI, on click the thumb is being set to the mouse cursor position without taking into account the width of the thumb (half the width of the thumb should be subtracted from the mouse position in order for the thumb to be centered on the mouse cursor). But actually that would not even work perfectly, if the user clicks slightly off center it would still jump a little bit to center the thumb at the mouse position. On click, the thumb position should not change at all, and it should only change based on the difference in the mouse horizontal position since the initial click, while the click / drag is active.

Chrome 128.0.6613.120 on MacOS

Here is a screen recording of this issue:
https://streamable.com/dhkh9n

[comunicazione.orp]

I'm trying out the web version of Lightroom on MacOS. I'm finding a strange bug:

When clicking and holding on a slider thumb for example in the "Color" area, the thumb (the round button to control values by dragging along the track) automatically jumps over to the right. This is unexpected behaviour, it should stay put until the mouse cursor moves, and then follow the mouse cursor position in the horizontal movements.

I'm guessing that in the underlying UI, on click the thumb is being set to the mouse cursor position without taking into account the width of the thumb (half the width of the thumb should be subtracted from the mouse position in order for the thumb to be centered on the mouse cursor).
Here is a screen recording of this issue:
https://streamable.com/dhkh9n

[davescm]

Hi , I've moved your post from the Photoshop forum to the Lightroom forum where you are more likely to get answers relevant to your issue.

Dave

[comunicazione.orp]

Thanks it does belong in fact under the Lightroom ecosystem, however it should be under bugs and not under discussions. I don't think I can move it.

[comunicazione.orp]

The current "discussion" post can be deleted since I have opened a bug report at https://community.adobe.com/t5/lightroom-ecosystem-cloud-based-bugs/photo-edit-slider-thumb-jumps-on...