Fix: Clear selection after programmatic focus to prevent Firefox text selection (fixes #843)

[swashbuck]

Fixes #843

Fix

• In _refocusCurrentActiveElement(), call window.getSelection()?.removeAllRanges() immediately after the programmatic focus() call

Testing

1. Enable _accessibility._isEnabled: true in config.json
2. Open a page with body text in Firefox
3. Click a focusable element (e.g. a nav button) to give it focus
4. Click on non-focusable body text repeatedly
5. Verify no text is unexpectedly selected

Test in Chrome to confirm no regression.

JAWS regression check: The _refocusCurrentActiveElement() method being modified was introduced in #697 to prevent JAWS from scrolling when its virtual cursor interacts with grouped elements. removeAllRanges() only affects browser text selection state, which JAWS does not use, so regression is unlikely - but if JAWS testing is available, verify focus behaviour on role=group elements after this change.

Root Cause

PR #697 (v6.72.1) added _refocusCurrentActiveElement() to handle a JAWS virtual cursor scrolling issue. This method calls .focus() programmatically on the previously-active element whenever focus unexpectedly returns to body/html (via _onBlur).

Firefox sets a persistent selection anchor when focus is assigned programmatically. Because _onBlur fires between mousedown and mouseup on every click of non-focusable content, Firefox repositions the selection anchor on each click. The next mousedown then extends the selection from that anchor to the new click point.

Calling removeAllRanges() immediately after focus() clears the anchor before mouseup can use it - so no text is selected and there is no visible flash. JAWS is unaffected as it uses its own virtual cursor, not browser text selection state.

---

Posted via collaboration with Claude Code