Fix issue with hover reappearing on Esc, Alt-tab, link click etc.

[pwang347]

To reproduce:

1. Click on the Copilot status bar item
2. Press Esc
3. Notice that the hover reappears momentarily
4. If you now click the hover, it instantly disappears

[Copilot]

Pull request overview

This PR aims to prevent managed hovers from immediately reappearing after they were dismissed (e.g. via Esc, window deactivation/Alt-tab, clicking within the hover), by adding additional guards in the managed-hover focus handler and covering the behavior with new unit tests.

Changes:

• Add focus-event guards in HoverService.setupManagedHover to avoid re-triggering a hover when focus returns from a dismissed hover or from window reactivation.
• Add new HoverService tests asserting that dismissed hovers don’t re-show on subsequent focus events under specific relatedTarget conditions.

Show a summary per file

File	Description
src/vs/platform/hover/browser/hoverService.ts	Adds early-return conditions in the managed-hover onFocus handler to avoid re-showing hovers after dismissal/focus transitions.
src/vs/platform/hover/test/browser/hoverService.test.ts	Adds regression tests for focus-driven hover reappearance after dismissal.

Copilot's findings

• Files reviewed: 2/2 changed files
• Comments generated: 2