disables all animation of NSPopover (for use in SwiftUI apps where there is no control over popover display animation

NSPopover_OverrideAnimation.h

//
//  NSPopover_OverrideAnimation.h
//  scrl (macOS)
//
//  Created by Mark Onyschuk on 2022-02-07.
//

#import <Cocoa/Cocoa.h>

NS_ASSUME_NONNULL_BEGIN

@interface NSPopover (NSPopover_Override)
@end

NS_ASSUME_NONNULL_END

NSPopover_OverrideAnimation.m

//
//  NSPopover_OverrideAnimation.m
//  scrl (macOS)
//
//  Created by Mark Onyschuk on 2022-02-07.
//

#import "NSPopover_OverrideAnimation.h"

#import <objc/runtime.h>

@implementation NSPopover (NSPopover_OverrideAnimation)

+ (void)load {
    Method mold = class_getInstanceMethod(self, @selector(animates));
    Method mnew = class_getInstanceMethod(self, @selector(swizzled_animates));
    
    if (mold != nil && mnew != nil) {
        method_exchangeImplementations(mold, mnew);
    }
}

- (BOOL)swizzled_animates {
    return NO;
}

@end