gtk: get closing of tabs working again (closing windows still broken)

src/apprt/gtk/Split.zig

@@ -90,6 +90,18 @@ pub fn init(
     surface.grabFocus();
 }
 
+pub fn destroy(self: *Split) void {
+    const window = self.container.window() orelse return;
+
+    self.top_left.destroy();
+    self.bottom_right.destroy();
+
+    self.removeChildren();
+
+    // TODO: this is the same as in removeChild?
+    window.app.core_app.alloc.destroy(self);
+}
+
 /// Remove the top left child.
 pub fn removeTopLeft(self: *Split) void {
     self.removeChild(self.top_left, self.bottom_right);
@@ -120,7 +132,7 @@ inline fn removeChild(self: *Split, remove: Surface.Container.Elem, keep: Surfac
     self.container.replace(keep);
 
     // TODO: is this correct?
-    remove.shutdown();
+    remove.destroy();
     window.app.core_app.alloc.destroy(self);
 }
 

src/apprt/gtk/Surface.zig

@@ -79,12 +79,10 @@ pub const Container = union(enum) {
             };
         }
 
-        pub fn shutdown(self: Elem) void {
+        pub fn destroy(self: Elem) void {
             switch (self) {
-                .surface => |s| s.shutdown(),
+                .surface => |s| s.unref(),
-                .split => {
+                .split => |s| s.destroy(),
-                    @panic("TODO: shutdownsplit");
-                },
             }
         }
 
@@ -416,9 +414,9 @@ pub fn deinit(self: *Surface) void {
     if (self.cursor) |cursor| c.g_object_unref(cursor);
 }
 
-// shutdown removes the long-held reference to the gl_area and kicks off the
+// unref removes the long-held reference to the gl_area and kicks off the
 // deinit/destroy process for this surface.
-pub fn shutdown(self: *Surface) void {
+pub fn unref(self: *Surface) void {
     c.g_object_unref(self.gl_area);
 }
 

src/apprt/gtk/Tab.zig

@@ -142,7 +142,7 @@ pub fn init(self: *Tab, window: *Window, parent_: ?*CoreSurface) !void {
 
 /// Deinits tab by deiniting child elem.
 pub fn deinit(self: *Tab) void {
-    self.elem.shutdown();
+    self.elem.destroy();
 }
 
 // TODO: move this