WIP: gtk: handle split surfaces when closing tab/window

src/apprt/gtk/Paned.zig

@@ -219,3 +219,21 @@ fn addChild2(self: *Paned, child: Child) void {
     self.child2 = child;
     child.setParent(.{ .paned = .{ self, .end } });
 }
+
+pub fn deinit(self: *Paned, alloc: Allocator) void {
+    switch (self.child1) {
+        .none, .surface => {},
+        .paned => |paned| {
+            paned.deinit(alloc);
+            alloc.destroy(paned);
+        },
+    }
+
+    switch (self.child2) {
+        .none, .surface => {},
+        .paned => |paned| {
+            paned.deinit(alloc);
+            alloc.destroy(paned);
+        },
+    }
+}

src/apprt/gtk/Tab.zig

@@ -163,3 +163,17 @@ fn gtkTabCloseClick(_: *c.GtkButton, ud: ?*anyopaque) callconv(.C) void {
     const window = tab.window;
     window.closeTab(tab);
 }
+
+pub fn close(self: *Tab) void {
+    switch (self.child) {
+        .none => return,
+        .surface => {
+            // TODO: I'm not 100% but I don't think we have to do something
+            return;
+        },
+        .paned => |paned| {
+            paned.deinit(self.window.app.core_app.alloc);
+            self.window.app.core_app.alloc.destroy(paned);
+        },
+    }
+}

src/apprt/gtk/Window.zig

@@ -189,7 +189,10 @@ fn initActions(self: *Window) void {
 
 pub fn deinit(self: *Window) void {
     self.icon.deinit(self.app);
-    for (self.tabs.items) |tab| self.app.core_app.alloc.destroy(tab);
+    for (self.tabs.items) |tab| {
+        tab.close();
+        self.app.core_app.alloc.destroy(tab);
+    }
     self.tabs.deinit(self.app.core_app.alloc);
 }
 
@@ -214,6 +217,7 @@ pub fn removeTab(self: *Window, tab: *Tab) !void {
     if (tab_idx) |idx| _ = self.tabs.orderedRemove(idx) else return error.TabNotFound;
 
     // Deallocate the tab
+    tab.close();
     self.app.core_app.alloc.destroy(tab);
 }