Prevent breaking constraint on collapsable NSSplitView

I have a NSSplitView which contains a NSSearchField. It looks like this:

I've created the NSSearchField with the following code:

- (void) applicationDidFinishLaunching: (NSNotification *) aNotification
{
    searchField = [[NSSearchField alloc] init];
    searchField.translatesAutoresizingMaskIntoConstraints = NO;
    [leftView addSubview: searchField];
    [searchField.leadingAnchor constraintEqualToAnchor: leftView.leadingAnchor
                                              constant: 1.0f].active = YES;
    [searchField.trailingAnchor constraintEqualToAnchor: leftView.trailingAnchor
                                               constant: -1.0f].active = YES;
    [searchField.topAnchor constraintEqualToAnchor: leftView.topAnchor
                                          constant: 1.0f].active = YES;
    [searchField.heightAnchor constraintEqualToConstant: 22.0f].active = YES;
}

This works fine and I can resize the splitter with no problem.

If I however, add the following NSSplitViewDelegate method (trying to make the left side completely collapsable):

- (CGFloat)splitView:(NSSplitView *)splitView
constrainMinCoordinate:(CGFloat)proposedMinimumPosition
         ofSubviewAt:(NSInteger)dividerIndex
{
    if(0 == dividerIndex)
    {
        return 0;
    }

    return proposedMinimumPosition;
}

Now if I resize the splitter so that the left view is collapsed, I get a constraint violation.

AnchorTest[57668:1656122] [Layout] Unable to simultaneously satisfy constraints:
(
    "<NSAutoresizingMaskLayoutConstraint:0x604000084c40 h=--& v=--& NSView:0x60c000120b40.width == 0.5   (active)>",
    "<NSLayoutConstraint:0x60c0000822b0 H:|-(1)-[NSSearchField:0x100412290]   (active, names: '|':NSView:0x60c000120b40 )>",
    "<NSLayoutConstraint:0x60c000085f50 NSSearchField:0x100412290.trailing == NSView:0x60c000120b40.trailing   (active)>"
)

Which makes sense.. Obviously the search field leading/trailing anchors cannot be offset by -1 and if I remove the offset, the constraints have no issues.

The problem is that I want the left/right offset. There must be a way to do this via AutoLayout, but I'm not able to figure it out. Does anyone know how one would properly do this?

Dragging the divider to the end is not the same as collapsing. Return the minimal useable size from constrainMinCoordinate and implement splitView:canCollapseSubview:.