Preset Manager from Unified Settings doesn't allow drag and drop

1. What happened
Before Unified Settings window, the Preset manager was an Editor Window which was supporting drag and drop of a preset in the list. Now that PresetManger is part of the Unified Settings window, the drag and drop doesn't work anymore.

2. How we can reproduce it using the example you attached

1. Open the attached project ... or ... simply create a new project
2. Use provided "Light.preset" file in the Assets folder ... or ... create a preset yourself from any component
3. Open the Unified Settings window ("Edit -> Settings") and select the Preset Manager
4. Drag the preset from your project panel into the preset manager settings panel

Result: Drag and Drop isn't allowed
Expected: Drag and Drop should work like when the Preset Manager was an individual Editor Window