Desktop icons spacing sliders rearrange icons even if auto-arrange off is set

Distribution

Linux Mint 22.1 Xia base: Ubuntu 24.04 noble

Package version

Cinnamon v: 6.4.8 tk: GTK v: 3.24.41 wm: Muffin v: 6.4.1 vt: 7 dm: LightDM v: 1.30.0

Graphics hardware in use

AMD Navi 33 [Radeon RX 7700S/7600/7600S/7600M XT/PRO W7600] *from sysinfo

Frequency

Always

Bug description

In the desktop setting [R click desktop->customize, ] adjusting icon spacing sliders rearranges the desktop icons in addition to adjusting the spacing; Ignoring auto-arrange set to off

Steps to reproduce

place icons in groups vertically and horizontally spaced, in no particular order
R-click desktop -> customize
set auto-arrange toggle off

adjust vertical or horizontal sliders
The icons will move to top left wrapping descending column in a rearranged order

Expected behavior

Icons should remain in their relative positions and only the distance between them should change

Additional information

No response

Start by reproducing the issue from the desktop context menu: place icons in groups, disable auto-arrange, then adjust the vertical and horizontal spacing sliders. Trace the desktop settings/customize implementation and slider handling. Done means spacing changes without moving icons into a reordered column, with auto-arrange still disabled.