Add #[non_exhaustive] to OutputInfo

This allows fields to be added in the future without needing an API break.
Because OutputInfo is already a large struct, it's unlikely anyone is
fully destructuring it.

Author: danieldg

CHANGELOG.md

@@ -5,6 +5,11 @@
 - Batch output information updates instead of potentially making multiple
   callbacks for one logical change
 
+#### Breaking Changes
+
+- Mark OutputInfo as `#[non_exhaustive]` to allow future expansion without
+  breaking API.
+
 #### Additions
 
 - `Window::start_interactive_move` to enable dragging the window with a user action

src/output.rs

@@ -41,6 +41,7 @@ pub struct Mode {
 }
 
 #[derive(Clone, Debug)]
+#[non_exhaustive]
 /// Compiled information about an output
 pub struct OutputInfo {
     /// The ID of this output as a global