WIP: macos: Always run TIS.. and NS.. functions on main thread

Some functions can only be called from the main thread. If they are called from another thread, it can lead to panics. This likely is the cause for Tauri crashing with enigo. There are functions available to send functions to the main thread that then get executed there. We should use those so enigo can be used from other threads too

Fixes #153
Fixes tauri-apps/tauri#6421
Fixes #352

Cargo.toml

@@ -66,6 +66,7 @@ objc2-foundation = { version = "0.3", default-features = false, features = [
     "objc2-core-foundation",
     "NSGeometry",
 ] }
+dispatch2 = "0.2"
 foreign-types-shared = "0.3"
 
 [target.'cfg(all(unix, not(target_os = "macos")))'.dependencies]

src/macos/macos_impl.rs

@@ -19,6 +19,7 @@ use core_graphics::{
     },
     event_source::{CGEventSource, CGEventSourceStateID},
 };
+use dispatch2::run_on_main;
 use foreign_types_shared::ForeignTypeRef as _;
 use log::{debug, error, info};
 use objc2::msg_send;
@@ -549,6 +550,9 @@ impl Enigo {
 
         let held = (Vec::new(), Vec::new());
 
+        run_on_main(|mtm| {
+            // Do something on the main thread with the given marker
+        });
         let mut event_flags = CGEventFlags::CGEventFlagNonCoalesced;
         event_flags.set(CGEventFlags::from_bits_retain(0x2000_0000), true); // I don't know if this is needed or what this flag does. Correct events have it
         // set so we also do it (until we know it is wrong)