Fix token popup link clicks triggering input blur

[Copilot]

Clicking links in the token format popup (e.g., "Learn more") was closing the popup instead of navigating. The input blur handler fires before the click completes, hiding the popup prematurely.

Changes

• Added mousedown handler to popup element that prevents default for anchor tags
• Preserves focus on input while allowing link navigation
• Uses case-insensitive tag check (toUpperCase()) for DOM compatibility

$popup.addEventListener('mousedown', (e) => {
    const target = e.target as HTMLElement;
    if (target.tagName?.toUpperCase() === 'A' || target.closest('a')) {
        e.preventDefault();
    }
});

Handler registered once during popup content initialization to avoid duplicate listeners.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Cannot click "Learn more" in GitLens setting popup</issue_title>
<issue_description>When setting the Inline Blame "Annotation format," the "Learn more" link at the bottom of the popover cannot be clicked.

Code

Clicking the link instead closes the popover.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Cannot click "Learn more" in GitLens setting popup #4953

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.