Revert "apprt/gtk: add menu to new tab button to create splits (#7127)"

This reverts commit 14134d61fb, reversing
changes made to 6a876ef8ec.

This causes translation failures, this should be reintroduced when the
CI check passes.

src/apprt/gtk/Window.zig

@@ -25,7 +25,6 @@ const input = @import("../../input.zig");
 const CoreSurface = @import("../../Surface.zig");
 
 const App = @import("App.zig");
-const Builder = @import("Builder.zig");
 const Color = configpkg.Config.Color;
 const Surface = @import("Surface.zig");
 const Menu = @import("menu.zig").Menu;
@@ -243,19 +242,12 @@ pub fn init(self: *Window, app: *App) !void {
     }
 
     {
-        const btn = adw.SplitButton.new();
-        btn.setIconName("tab-new-symbolic");
+        const btn = gtk.Button.newFromIconName("tab-new-symbolic");
         btn.as(gtk.Widget).setTooltipText(i18n._("New Tab"));
-        btn.setDropdownTooltip(i18n._("New Split"));
-
-        var builder = Builder.init("menu-headerbar-split_menu", 1, 0, .blp);
-        defer builder.deinit();
-        btn.setMenuModel(builder.getObject(gio.MenuModel, "menu"));
-
-        _ = adw.SplitButton.signals.clicked.connect(
+        _ = gtk.Button.signals.clicked.connect(
             btn,
             *Window,
-            adwNewTabClick,
+            gtkTabNewClick,
             self,
             .{},
         );
@@ -832,11 +824,6 @@ fn gtkTabNewClick(_: *gtk.Button, self: *Window) callconv(.c) void {
     self.performBindingAction(.{ .new_tab = {} });
 }
 
-/// Create a new surface (tab or split).
-fn adwNewTabClick(_: *adw.SplitButton, self: *Window) callconv(.c) void {
-    self.performBindingAction(.{ .new_tab = {} });
-}
-
 /// Create a new tab from the AdwTabOverview. We can't copy gtkTabNewClick
 /// because we need to return an AdwTabPage from this function.
 fn gtkNewTabFromOverview(_: *adw.TabOverview, self: *Window) callconv(.c) *adw.TabPage {

src/apprt/gtk/gresource.zig

@@ -75,7 +75,6 @@ pub const VersionedBlueprint = struct {
 pub const blueprint_files = [_]VersionedBlueprint{
     .{ .major = 1, .minor = 5, .name = "prompt-title-dialog" },
     .{ .major = 1, .minor = 5, .name = "config-errors-dialog" },
-    .{ .major = 1, .minor = 0, .name = "menu-headerbar-split_menu" },
     .{ .major = 1, .minor = 0, .name = "menu-surface-context_menu" },
     .{ .major = 1, .minor = 0, .name = "menu-window-titlebar_menu" },
     .{ .major = 1, .minor = 5, .name = "ccw-osc-52-read" },

src/apprt/gtk/ui/1.0/menu-headerbar-split_menu.blp

@@ -1,25 +0,0 @@
-using Gtk 4.0;
-
-menu menu {
-  section {
-    item {
-      label: _("Split Up");
-      action: "win.split-up";
-    }
-
-    item {
-      label: _("Split Down");
-      action: "win.split-down";
-    }
-
-    item {
-      label: _("Split Left");
-      action: "win.split-left";
-    }
-
-    item {
-      label: _("Split Right");
-      action: "win.split-right";
-    }
-  }
-}