Pull Request: Add dedicated split buttons

[Underknowledge]

Heya, I'm comig from Tilix and I would Like to add a feature for dedicated Split buttons.
But... I dont know if it is wanted in any way.

I replaced in this case the dropdown. But if I would put in a PR, I would expect these to go into the config.

I use here already gtk-titlebar-style = tabs

so maybe
gtk-titlebar-disable-dropdown = true defaults to false
gtk-titlebar-button-split-horzontal = true /right (false, left,right, both)
gtk-titlebar-button-split-vertical = true /down (false, down, up, both)

|| Dirty Dirty POC||

diff --git a/src/apprt/gtk/ui/1.5/window.blp b/src/apprt/gtk/ui/1.5/window.blp
index 8c0a7bedb..18d3ffc1d 100644
--- a/src/apprt/gtk/ui/1.5/window.blp
+++ b/src/apprt/gtk/ui/1.5/window.blp
@@ -51,14 +51,33 @@ template $GhosttyWindow: Adw.ApplicationWindow {
         };

         [start]
-        Adw.SplitButton {
-          clicked => $new_tab();
-          icon-name: "tab-new-symbolic";
-          tooltip-text: _("New Tab");
-          dropdown-tooltip: _("New Split");
-          menu-model: split_menu;
-          can-focus: false;
-          focus-on-click: false;
+        Gtk.Box {
+          orientation: horizontal;
+          spacing: 6;
+
+          Gtk.Button {
+            clicked => $new_tab();
+            icon-name: "tab-new-symbolic";
+            tooltip-text: _("New Tab");
+            can-focus: false;
+            focus-on-click: false;
+          }
+
+          Gtk.Button {
+            action-name: "win.split-right";
+            icon-name: "view-paged-symbolic";
+            tooltip-text: _("Split Right");
+            can-focus: false;
+            focus-on-click: false;
+          }
+
+          Gtk.Button {
+            action-name: "win.split-down";
+            icon-name: "view-dual-symbolic";
+            tooltip-text: _("Split Down");
+            can-focus: false;
+            focus-on-click: false;
+          }
         }

         [end]
@@ -97,7 +116,7 @@ template $GhosttyWindow: Adw.ApplicationWindow {
             side: start;
           }

-          Adw.SplitButton {
+          Gtk.Button {
             styles [
               "flat",
             ]
@@ -105,8 +124,30 @@ template $GhosttyWindow: Adw.ApplicationWindow {
             clicked => $new_tab();
             icon-name: "tab-new-symbolic";
             tooltip-text: _("New Tab");
-            dropdown-tooltip: _("New Split");
-            menu-model: split_menu;
+            can-focus: false;
+            focus-on-click: false;
+          }
+
+          Gtk.Button {
+            styles [
+              "flat",
+            ]
+
+            action-name: "win.split-right";
+            icon-name: "view-paged-symbolic";
+            tooltip-text: _("Split Right");
+            can-focus: false;
+            focus-on-click: false;
+          }
+
+          Gtk.Button {
+            styles [
+              "flat",
+            ]
+
+            action-name: "win.split-down";
+            icon-name: "view-dual-symbolic";
+            tooltip-text: _("Split Down");
             can-focus: false;
             focus-on-click: false;
           }

So yea, when you want to see it, just like it - or have ideas how you think it should get configured.. Let me know.
Else I ll just use my overlay