[Bug] Black square when reordering items

[Frumkin13]

Step 1. Pre-report Checklist

• I checked if there is already an open issue that described my problem.
• I checked if there is already an open issue at Millennium that describes my problem.
• I ticked the checkboxes without reading them.
• I checked the Update tab to see if there was an update.

Step 2. Theme configuration

Configuration

    "Steam": {
      "Achievement Notification": "no",
      "Add shelf button": "no",
      "Add shelf button visibility": "no",
      "Always show game infos": "no",
      "Always show sidebar": "Enabled",
      "Banner Infos": "yes",
      "Banner position": "Middle (default)",
      "Big Picture Mode button": "yes",
      "Bigger banner": "yes",
      "Broadcast": "yes",
      "Color theme": "Default",
      "Community - Profile pages header": "no",
      "Community - VAC-Ban visibility": "Show",
      "Darken not installed games": "yes",
      "Digital product info": "yes",
      "Dynamic banner height": "yes",
      "Follow the creators": "yes",
      "Font": "Be Vietnam Pro (default)",
      "Footer": "no",
      "Friend icon": "no",
      "Friend list button": "no",
      "Game Overlay": "no",
      "Game cover shiny effect": "yes",
      "Game cover shiny effect visibility": "no",
      "Game info box artwork": "no",
      "Gamepage always show game infos": "no",
      "Gamepage game info box artwork": "no",
      "Gamepage sidebar on left": "no",
      "General - Achievement Notification": "no",
      "General - Always show sidebar": "Enabled",
      "General - Big Picture Mode button": "yes",
      "General - Font": "Be Vietnam Pro (default)",
      "General - Friend icon": "no",
      "General - Friend list button": "no",
      "General - Game Overlay": "no",
      "General - Mica & Acrylic plugin support": "yes",
      "General - Navigation buttons": "no",
      "General - News button": "yes",
      "General - Notification button": "no",
      "General - Scrollbars": "no",
      "General - Sidebar only on hover": "yes",
      "General - Steam VR button": "yes",
      "General - System accent colors": "yes",
      "General - Userpannel": "yes",
      "General - Wallet balance": "no",
      "General - Window Controls": "Show only on hover",
      "Hide What's New shelf": "no",
      "Hide group chat": "no",
      "Info sidebar on right": "no",
      "Landing Header": "no",
      "Library - Add shelf button": "no",
      "Library - Always show game infos": "no",
      "Library - Banner Infos": "yes",
      "Library - Banner position": "Middle (default)",
      "Library - Bigger banner": "yes",
      "Library - Darken not installed games": "yes",
      "Library - Dynamic banner height": "no",
      "Library - Game cover shiny effect": "yes",
      "Library - Game info box artwork": "no",
      "Library - Sidebar on left": "no",
      "Library - Steam-Custom-Artworks Support": "no",
      "Library - What's New": "Show",
      "Login QR code": "Show",
      "Mica & Acrylic plugin support": "no",
      "Navigate button": "no",
      "Navigation buttons": "no",
      "News button": "yes",
      "Notification button": "no",
      "Profile pages header": "no",
      "Recommendations": "yes",
      "Remove rounded corners": "no",
      "Scrollbars": "yes",
      "Shop Cart Recommendations": "yes",
      "Show Library sidebar on hover": "no",
      "Sidebar on left": "no",
      "Sidebar only on hover": "yes",
      "Steam VR button": "yes",
      "Steam-Custom-Artworks Support": "no",
      "Store - Broadcast": "yes",
      "Store - Digital product info": "yes",
      "Store - Follow the creators": "yes",
      "Store - Footer": "yes",
      "Store - Info sidebar on right": "no",
      "Store - Landing Header": "yes",
      "Store - Recommendations": "yes",
      "Store - URL bar": "no",
      "Store - Write a Review": "yes",
      "System accent colors": "yes",
      "URL bar": "no",
      "Userpannel": "yes",
      "Userpannel & Downloadpannel": "yes",
      "VAC-Ban visibility": "Show",
      "Wallet balance": "no",
      "Wallet visibility": "no",
      "What's New": "Show",
      "Window Controls": "Show only on hover",
      "Window controls layout": "Adwaita",
      "Window controls theme": "Adwaita",
      "Write a Review": "yes"

Step 3. Describe the issue

Hi, recently wanted to change the order of items in the steam overlay but encountered this bug: When you drag any item this big black square pops up until you release the item. Checked with default theme and everything is fine there.
(I use today's version with user panel fix and download bar)

Step 4. How to reproduce

Settings > in game > Taskbar settings (Under delete browser data) > press it and try to drag any item

Anything else?

Thank you for this great theme, great work! Hope you will fix this and issue with resizing of user panel on hover. Wish you all the best!