From e08f3c306dc6aa61a91fc06e3f999bbd6d9d520b Mon Sep 17 00:00:00 2001
From: visionmercer <62051836+visionmercer@users.noreply.github.com>
Date: Wed, 27 May 2026 13:48:34 +0200
Subject: [PATCH] rudimentary undo functionality

---
 pixler.bas | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/pixler.bas b/pixler.bas
index 682e495..1426a1a 100644
--- a/pixler.bas
+++ b/pixler.bas
@@ -140,6 +140,16 @@ do
             showcolorpicker=not showcolorpicker
         case "l"
             showcommands=not showcommands
+        case chr$(26) ' Ctrl+Z
+            if ubound(commands) > 3 then
+                ' Drop the trailing empty slot AND the last valid command
+                redim _preserve commands(ubound(commands) - 2) as string
+                
+                ' Re-create the empty trailing slot required by addcommand
+                redim _preserve commands(ubound(commands) + 1) as string
+                
+                redraw             
+            end if
     end select
 
     ' 4. Draw everything using the freshly updated math