Grouped Window List: juddering when moving items

[LinuxOnTheDesktop]

 * Cinnamon version (cinnamon --version) 4.0.10
   - Please specify if you are using the daily builds PPA (https://launchpad.net/~linuxmint-daily-build-team/+archive/ubuntu/daily-builds): yes, but problem predates the alpha.
 * Distribution - (Mint 17.2, Arch, Fedora 25, etc...) Mint 19.1.
 * Graphics hardware *and* driver used: Intel UHD Graphics 620 3.0 Mesa 18.2.8.
 * 32 or 64 bit: 64
 * Attach /home/<username>/.xsession-errors, or /var/log/syslog

Issue

When dragging items within the Grouped Window List applet, they judder from one position to another. That looks bad and makes the applet harder to use.

Steps to reproduce

Try dragging an item around a bit.
I'd attach a video but the Mint video tool remains broken (will hang the PC), so far as I know.

Expected behaviour

No juddering. Implementing some sort of threshold would do it, I imagine.

Other information

This is a cosmetic issue that many people will run into and it does not make the OS look good. Or so it seems to me.

[JosephMcc]

I see what you mean here. It's very minor but would be nice if it was a bit smoother looking.

[LinuxOnTheDesktop]

Thanks. One can underestimate the effect that such problems, especially in concert (i.e. when the user encounters multiple such problems[1]) upon the user. Also and as I said: this particular problem is not wholly cosmetic.

[1] One other cosmetic-cum-usability problem is this one, with MintUpdate.