"Blackboard" and "Graph Inspector" tooltips appear and flicker when resizing their overlays

Steps to reproduce:

1. Create a new project using Universal 3D template
2. Import the attached "MySimpleGraph.cs" into the Project
3. Go to Assets > Create > Graph Toolkit Samples > Simple Graph
4. Open the created graph
5. Ensure the Blackboard (or Graph Inspector) overlay is open and visible
6. Hover over the edge of the Blackboard overlay until the resize cursor appears
7. Click and hold to resize the overlay
8. Slowly drag to resize the panel and observe the bottom area of the overlay

Actual results: A "Blackboard" tooltip appears and flickers (appears and disappears) while the panel is being resized

Expected results: No tooltips appear during the drag interaction

Reproducible with versions: 0.4.0-exp.2 (6000.3.12f1), 6000.4.1f1, 6000.5.0b2, 6000.6.0a2

Tested on (OS): Windows 11

Notes:

• This behavior also applies to the "Graph Inspector" overlay
• Tooltips are typically expected to be suppressed during active drag interactions (like resizing)