apprt/gtk-ng: close inspector window when widget loses surface

src/apprt/gtk-ng/class/inspector_widget.zig

@@ -104,6 +104,10 @@ pub const InspectorWidget = extern struct {
         ));
     }
 
+    pub fn getSurface(self: *Self) ?*Surface {
+        return self.private().surface;
+    }
+
     pub fn setSurface(self: *Self, surface_: ?*Surface) void {
         const priv = self.private();
 

src/apprt/gtk-ng/class/inspector_window.zig

@@ -157,6 +157,22 @@ pub const InspectorWindow = extern struct {
         ));
     }
 
+    //---------------------------------------------------------------
+    // Signal Handlers
+
+    fn propInspectorSurface(
+        inspector: *InspectorWidget,
+        _: *gobject.ParamSpec,
+        self: *Self,
+    ) callconv(.c) void {
+        // If the inspector's surface went away, we destroy the window.
+        // The inspector has a weak notify on the surface so it knows
+        // if it goes nil.
+        if (inspector.getSurface() == null) {
+            self.as(gtk.Window).destroy();
+        }
+    }
+
     const C = Common(Self, Private);
     pub const as = C.as;
     pub const ref = C.ref;
@@ -184,6 +200,9 @@ pub const InspectorWindow = extern struct {
             // Template Bindings
             class.bindTemplateChildPrivate("inspector_widget", .{});
 
+            // Template callbacks
+            class.bindTemplateCallback("notify_inspector_surface", &propInspectorSurface);
+
             // Properties
             gobject.ext.registerProperties(class, &.{
                 properties.surface.impl,

src/apprt/gtk-ng/ui/1.5/inspector-window.blp

@@ -30,6 +30,7 @@ template $GhosttyInspectorWindow: Adw.ApplicationWindow {
       }
 
       $GhosttyInspectorWidget inspector_widget {
+        notify::surface => $notify_inspector_surface();
         surface: bind template.surface;
       }
     }