RxSwift: Typing/Idle Event Stream for NSTextView

To improve my note editing app The Archive's responsiveness, I want to find out when the user is actively editing a note. Here's how to create the idle switch in RxSwift/RxCocoa. A simple enum of .typing and .idle will do for a start. Of course, NSTextViewDelegate provides a textDidChange(_:) callback to hook into; it's based on a notification, so you can also subscribe to the NSText.didChangeNotification directly if you don't want to use a delegate. That's the input signal I'm going to use.

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Why the Selection Changes When You Do Syntax Highlighting in a NSTextView and What You Can Do About It

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On iOS, this does maybe not happen at all, but when you want to write syntax highlighting code for macOS apps, copying together stuff from around the web, you'll end up with broken application behavior. In short: when you type and the attributes of the line change, the insertion point is moved to the end of the line. That sucks.

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