Awkward sash dragging experience for bottom sash of last hidden range

[alexdima]

Testing #199155

• try to reveal the bottom lines in the first changed file
• it is not possible to drag down to see the last lines in the file
• instead it is necessary to drag up and have the sash move away from the mouse cursor which is very confusing
• in the video below the dragging to reveal the first lines is natural, but the dragging to reveal the last lines feels to be in the wrong direction.

Kapture.2023-11-28.at.14.09.04.mp4

[alexdima]

Actually this appears to be a problem with all the bottom sashes of all hidden info bars not just with the last line. I think the rule should be that the drag targets must remain under the cursor while they are being dragged.

Kapture.2023-11-28.at.14.12.42.mp4