Supporting toolbar visibility in macOS 10.14 Mojave - objective-c

Question

I was testing how an existing application works on Mojave and I found strange problem with the layout. Toggle window toolbar visibility off then back on makes toolbar to appear on top of the content instead of pushing it down.
Snippet:
CustomPopUp *popup = [CustomPopUp popup];
__weak CustomRevealViewController *rev = self.revealViewController;
__weak NSWindow *window = self.view.window;
// Called when user taps in the popup view
[popup setCloseAction:^(BOOL success){
[rev removeOverlayController];
// !!! After this layout breaks
[window.toolbar setVisible:YES];
}];
[window.toolbar setVisible:NO];
[self.revealViewController showOverlayController:popup];
Any idea what could cause the problem and how to fix it?
Edit 1:
I've created a simple project here.
Steps to reproduce:
Run the project with Xcode 10 beta (Requires Mac OSX Mojave)
Press "Hide toolbar" button. This will hide the toolbar and will
update the button title.
Press "Show toolbar"
Resut:
Toolbar looks broken. It is over the controller.
Expected result:
It should work like on any other OS version. Controller's top constraint should be moved down.
Edit 2:
Maybe I found a clue in the AppKit Release Notes for macOS 10.14 beta under Layer-Backed Views section.
Views that implicitly depend on being redrawn when an ancestor,
descendant, or intersecting sibling is redrawn may not be redrawn. As
before, if a view needs to be redrawn, set its needsDisplay property
to YES. Views that return YES from wantsUpdateLayer will typically be
given an exclusive layer, even if the view's wantsLayer property is
set to NO. Apps targeting macOS 10.14 should prefer the
wantsUpdateLayer property over the wantsLayer property.
I'm still not sure how to fix it.
Edit 3:
With the official release of Mojave this is no longer an issue. Thank you I really appreciate your help.

Answer 1

I have a similar problem. I have a spash window without toolbar and then I fade it out and show another window with a toolbar.
The window with toolbar has broken layout in official release of Mojave (view appears beneath the toolbar). To fix it, I hide and then show again window's toolbar:
- (void)viewWillAppear
{
[super viewWillAppear];
if (_firstTime) {
_firstTime = NO;
NSWindow *window = self.view.window;
window.toolbar.visible = NO;
window.toolbar.visible = YES;
}
}