app/internal/wm: [macOS] run closure on main thread earlier if possible

Signed-off-by: pierre <pierre.curto@gmail.com>

app/internal/wm/os_darwin.go

@@ -16,6 +16,7 @@ __attribute__ ((visibility ("hidden"))) void gio_setDisplayLinkDisplay(CFTypeRef
 __attribute__ ((visibility ("hidden"))) void gio_hideCursor();
 __attribute__ ((visibility ("hidden"))) void gio_showCursor();
 __attribute__ ((visibility ("hidden"))) void gio_setCursor(NSUInteger curID);
+__attribute__ ((visibility ("hidden"))) bool gio_isMainThread();
 */
 import "C"
 import (
@@ -55,6 +56,10 @@ var mainFuncs = make(chan func(), 1)
 
 // runOnMain runs the function on the main thread.
 func runOnMain(f func()) {
+	if C.gio_isMainThread() {
+		f()
+		return
+	}
 	go func() {
 		mainFuncs <- f
 		C.gio_wakeupMainThread()

app/internal/wm/os_darwin.m

@@ -11,6 +11,10 @@ void gio_wakeupMainThread(void) {
 	});
 }
 
+bool gio_isMainThread() {
+	return [NSThread isMainThread];
+}
+
 NSUInteger gio_nsstringLength(CFTypeRef cstr) {
 	NSString *str = (__bridge NSString *)cstr;
 	return [str length];