Added #32

Crypto Notepad/ExRichTextBox.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Runtime.InteropServices;
 using System.Windows.Forms;
 
@@ -34,5 +34,59 @@ protected override void WndProc(ref Message m)
             base.WndProc(ref m);
         }
 
+    public static class RichTextBoxPadding
+    {
+        public static void SetInnerMargins(this TextBoxBase textBox, int left, int top, int right, int bottom)
+        {
+            var rect = textBox.GetFormattingRect();
+
+            var newRect = new Rectangle(left, top, rect.Width - left - right, rect.Height - top - bottom);
+            textBox.SetFormattingRect(newRect);
+        }
+
+        [StructLayout(LayoutKind.Sequential)]
+        private struct RECT
+        {
+            public readonly int Left;
+            public readonly int Top;
+            public readonly int Right;
+            public readonly int Bottom;
+
+            private RECT(int left, int top, int right, int bottom)
+            {
+                Left = left;
+                Top = top;
+                Right = right;
+                Bottom = bottom;
+            }
+
+            public RECT(Rectangle r) : this(r.Left, r.Top, r.Right, r.Bottom)
+            {
+            }
+        }
+
+        [DllImport(@"User32.dll", EntryPoint = @"SendMessage", CharSet = CharSet.Auto)]
+        private static extern int SendMessageRefRect(IntPtr hWnd, uint msg, int wParam, ref RECT rect);
+
+        [DllImport(@"user32.dll", EntryPoint = @"SendMessage", CharSet = CharSet.Auto)]
+        private static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, ref Rectangle lParam);
+
+        private const int EmGetrect = 0xB2;
+        private const int EmSetrect = 0xB3;
+
+        private static void SetFormattingRect(this TextBoxBase textbox, Rectangle rect)
+        {
+            var rc = new RECT(rect);
+            SendMessageRefRect(textbox.Handle, EmSetrect, 0, ref rc);
+        }
+
+        private static Rectangle GetFormattingRect(this TextBoxBase textbox)
+        {
+            var rect = new Rectangle();
+            SendMessage(textbox.Handle, EmGetrect, (IntPtr)0, ref rect);
+            return rect;
+        }
+    }
+}
     }
 }

Crypto Notepad/MainForm.cs

@@ -722,6 +722,7 @@ private void MainWindow_FormClosing(object sender, FormClosingEventArgs e)
             }
         }
 
+            richTextBox.SetInnerMargins(Convert.ToInt32(settings.editorPaddingLeft), 0, 0, 0);
 
         private void MainWindow_Load(object sender, EventArgs e)
         {