close_tab keybind (gtk apprt only) (#4033)

Title. Adds a close_tab keybind that essentially behaves the exact same
as clicking the tab close button on the tab bar.

src/apprt/action.zig

@@ -82,6 +82,9 @@ pub const Action = union(Key) {
     /// the tab should be opened in a new window.
     new_tab,
 
+    /// Closes the tab belonging to the currently focused split.
+    close_tab,
+
     /// Create a new split. The value determines the location of the split
     /// relative to the target.
     new_split: SplitDirection,
@@ -225,6 +228,7 @@ pub const Action = union(Key) {
         quit,
         new_window,
         new_tab,
+        close_tab,
         new_split,
         close_all_windows,
         toggle_fullscreen,

src/apprt/glfw.zig

@@ -218,6 +218,7 @@ pub const App = struct {
             .toggle_split_zoom,
             .present_terminal,
             .close_all_windows,
+            .close_tab,
             .toggle_tab_overview,
             .toggle_window_decorations,
             .toggle_quick_terminal,

src/apprt/gtk/App.zig

@@ -477,6 +477,7 @@ pub fn performAction(
         .toggle_fullscreen => self.toggleFullscreen(target, value),
 
         .new_tab => try self.newTab(target),
+        .close_tab => try self.closeTab(target),
         .goto_tab => self.gotoTab(target, value),
         .move_tab => self.moveTab(target, value),
         .new_split => try self.newSplit(target, value),
@@ -532,6 +533,23 @@ fn newTab(_: *App, target: apprt.Target) !void {
     }
 }
 
+fn closeTab(_: *App, target: apprt.Target) !void {
+    switch (target) {
+        .app => {},
+        .surface => |v| {
+            const tab = v.rt_surface.container.tab() orelse {
+                log.info(
+                    "close_tab invalid for container={s}",
+                    .{@tagName(v.rt_surface.container)},
+                );
+                return;
+            };
+
+            tab.window.closeTab(tab);
+        },
+    }
+}
+
 fn gotoTab(_: *App, target: apprt.Target, tab: apprt.action.GotoTab) void {
     switch (target) {
         .app => {},
@@ -1743,6 +1761,7 @@ fn initMenu(self: *App) void {
         c.g_menu_append_section(menu, null, @ptrCast(@alignCast(section)));
         c.g_menu_append(section, "New Window", "win.new_window");
         c.g_menu_append(section, "New Tab", "win.new_tab");
+        c.g_menu_append(section, "Close Tab", "win.close_tab");
         c.g_menu_append(section, "Split Right", "win.split_right");
         c.g_menu_append(section, "Split Down", "win.split_down");
         c.g_menu_append(section, "Close Window", "win.close");