FB11965199: NavigationSplitView need the ability to not allow hiding the sidebar

[sindresorhus]

• Date: 2023-01-24
• Resolution: Open
• Area: SwiftUI framework
• OS: macOS 13.1
• Type: Suggestion

Description

Currently, using NavigationSplitView adds a “toggle sidebar” toolbar button that cannot be removed. In addition, on macOS, the user is free to resize the sidebar to zero width, which hides it.

There are apps where it does not make sense to hide the sidebar. It would be nice if there was a modifier for this. Something similar to .interactiveDismissDisabled() like .sidebarCollapseDisabled(). The modifier would make it not add a “toggle sidebar” button to the toolbar and make it impossible for the user to resize to hide the sidebar on macOS.

For example, NSSplitViewItem has the ability to prevent hiding the sidebar with its .canCollapse = false property.