Eclipse Code mining: Line jumping flickering with Copilot installed although completion is disabled

It seems Copilot plugin is causing a repaint on every key-stroke even though Copilot completions are turned of. This results in jumping lines / flickering when Code Mining (e.g. method references) are enabled.

See the following comment by me with a description and videos of the problem:

https://github.com/eclipse-platform/eclipse.platform.ui/issues/2786#issuecomment-3642875815

which I am quoting here.
Not sure this is known but I noticed it today in new Eclipse 2025-12. Maybe it has been there before in 2025-09 too, but I don't know.

... here is a video of my current Eclipse where I see the flickering / jumping.
Notice that where I type the numbers, every keypress causes re-rendering.

https://github.com/user-attachments/assets/7853b764-bfc1-4336-976b-383e8ce88fcc

Environment

Eclipse IDE for Eclipse Committers (includes Incubating components)
Version: 2025-12 (4.38.0)
Build id: 20251204-0850

I have Copilot plugin installed (a suspicion, because on another 2025-12 instance, I don't have Copilot and I don't see this effect)

• GitHub Copilot 0.13.1.202511180215 com.microsoft.copilot.eclipse.feature.feature.group GitHub Copilot

BUT copilot completions are currently disabled.

Uninstalling Copilot

For comparison here is the same Eclipse with Copilot uninstalled.

https://github.com/user-attachments/assets/f475f83d-c1dc-4db4-8206-8cf4abd7ae0a

So I guess it is Copilot.

But maybe it helps others or you could tell the Copilot team about this.

Update: What I can't remember is if how exactly it behaved with 2025-09. It was just today that I found it very annoying so that I took the effort to google for the problem and found this issue.

Originally posted by @chrisrueger in #2786

Start by reproducing the flickering in Eclipse 2025-12 with Code Mining enabled, comparing Copilot installed versus uninstalled and completions disabled. Review the linked Eclipse Platform UI issue #2786 and the Copilot plugin behavior; done means identifying and addressing the repaint cause, then confirming that line jumping no longer occurs under the reported conditions.