From e0a7d25ddad2b94d4c330579bdbd45e5b5ca59a5 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 12 Jul 2024 12:13:31 +0530
Subject: [PATCH] Splits layout: Fix the move_to_screen_edge action breaking
 when only a single window is present

Fixes #7621
---
 docs/changelog.rst     |  2 ++
 kitty/layout/splits.py | 36 +++++++++++++++++++++---------------
 2 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/docs/changelog.rst b/docs/changelog.rst
index 7d41cf1e8..f1ae2dbd5 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -90,6 +90,8 @@ Detailed list of changes
 
 - Wayland: Fix an issue with mouse selections not being stopped when there are multiple OS windows (:iss:`7381`)
 
+- Splits layout: Fix the ``move_to_screen_edge`` action breaking when only a single window is present (:iss:`7621`)
+
 0.35.2 [2024-06-22]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/kitty/layout/splits.py b/kitty/layout/splits.py
index 8ae86c8e2..67a687d60 100644
--- a/kitty/layout/splits.py
+++ b/kitty/layout/splits.py
@@ -601,21 +601,27 @@ class Splits(Layout):
                         pair.one, pair.two = pair.two, pair.one
                     return True
         elif action_name == 'move_to_screen_edge':
-            args = args or ('left',)
-            which = args[0]
-            horizontal = which in ('left', 'right')
-            wg = all_windows.active_group
-            if wg is not None:
-                self.remove_windows(wg.id)
-                new_root = Pair(horizontal)
-                if which in ('left', 'top'):
-                    new_root.balanced_add(wg.id)
-                    new_root.two = self.pairs_root
-                else:
-                    new_root.one = self.pairs_root
-                    new_root.two = wg.id
-                self.pairs_root = new_root
-                return True
+            count = 0
+            for wid in self.pairs_root.all_window_ids():
+                count += 1
+                if count > 1:
+                    break
+            if count > 1:
+                args = args or ('left',)
+                which = args[0]
+                horizontal = which in ('left', 'right')
+                wg = all_windows.active_group
+                if wg is not None:
+                    self.remove_windows(wg.id)
+                    new_root = Pair(horizontal)
+                    if which in ('left', 'top'):
+                        new_root.balanced_add(wg.id)
+                        new_root.two = self.pairs_root
+                    else:
+                        new_root.one = self.pairs_root
+                        new_root.two = wg.id
+                    self.pairs_root = new_root
+                    return True
 
         return None