Repro steps:

1. Open System Preferences
2. Select Accessibility
3. Select the Zoom options from the sidebar
4. Check the Enable Hover Text setting.
5. Launch a Flutter app.
6. Hover the mouse pointer over a textfield or button (e.g. the click-counter FAB) and press the Command key to activate hover zoom.

Expected behaviour: Zoomed text appears in a tooltip-like window

Actual behaviour: App crashes with [ERROR:ax_platform_node_mac.mm(1019)] Reached unreachable code

Root cause: - (NSRange)accessibilityRangeForPosition:(NSPoint)point is currently implemented as unreachable.

Our current implementation matches Chromium's, however, this functionality does work for me in Chromium, so it's likely that we're getting this call as a fallback for some other call that's unimplemented in Flutter but implemented in Chromium:

• https://chromium.googlesource.com/chromium/src/+/main/ui/accessibility/platform/ax_platform_node_cocoa.mm#2020
• https://chromium.googlesource.com/chromium/src/+/main/ui/accessibility/platform/ax_platform_node_cocoa.mm#1589