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macOS: Fix checking for undocumented cursors (#4033)

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`AnyClass::responds_to` delegates to `class_respondsToSelector`, a
function provided by the Objective-C runtime. However, at some point,
this began to return `false` for selectors referring to undocumented
cursors, despite the cursors remaining accessible via said selectors.
That this check fails prevents the cursors from being used.

We can instead send `respondsToSelector:` to the `NSCursor` class
itself. As an instance method, this is nominally impossible; however,
Apple grants an exemption[1] that permits class objects to perform
instance methods defined in the root class.

Checking for the undocumented cursors in this way gets them working
again, at least on macOS Sequoia 15.1.1.

[1]: https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocObjectsClasses.html#//apple_ref/doc/uid/TP30001163-CH11-TPXREF120
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Skip R.
2024-12-08 13:01:57 -08:00
committed by Kirill Chibisov
parent 1e44c354fe
commit 836e717021
2 changed files with 3 additions and 2 deletions
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src/changelog/unreleased.md
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@@ -62,3 +62,4 @@ changelog entry.
- On X11, fix XInput handling that prevented a new window from getting the focus in some cases.
- On macOS, fix crash when pressing Caps Lock in certain configurations.
- On iOS, fixed `MonitorHandle`'s `PartialEq` and `Hash` implementations.
- On macOS, fixed undocumented cursors (e.g. zoom, resize, help) always appearing to be invalid and falling back to the default cursor.