(macOS) Opening a window in windowed mode unhides the dock sometimes

[dortamiguel]

Since SDL2 and in the latest SDL3 build I keep seeing this happening, when opening a window in windowed mode the dock will unhide sometimes.

This are the flags I'm using SDL_WINDOW_VULKAN, SDL_WINDOW_HIGH_PIXEL_DENSITY, SDL_WINDOW_RESIZABLE, SDL_WINDOW_FULLSCREEN

Is something I can't always reproduce, it will happen randomly a few times during the day.

Where I could start looking in the code to fix this? Is this something that might be happening to someone else?

[Zorbn]

I'm seeing this issue too. It happens for me consistently if I'm moving the mouse while the app launches but doesn't happen if the mouse is still.

EDIT:
Seems to be caused by this piece of code focusing the dock:

SDL/src/video/cocoa/SDL_cocoaevents.m

Lines 322 to 330 in 8c733d1

	if (!SDL_GetHintBoolean(SDL_HINT_MAC_BACKGROUND_APP, false)) {
	// Get more aggressive for Catalina: activate the Dock first so we definitely reset all activation state.
	for (NSRunningApplication *i in [NSRunningApplication runningApplicationsWithBundleIdentifier:@"com.apple.dock"]) {
	[i activateWithOptions:NSApplicationActivateIgnoringOtherApps];
	break;
	}
	SDL_Delay(300); // !!! FIXME: this isn't right.
	[NSApp activateIgnoringOtherApps:YES];
	}

I was able to work around the issue by setting SDL_MAC_BACKGROUND_APP to 1 after SDL_Init which is super hacky but seems to avoid running that specific piece of code while also not doing the normal background app stuff that's supposed to happen if you correctly enable SDL_MAC_BACKGROUND_APP before calling SDL_Init.