From 36d873d78def899a75396ff8fc59e5ecad79dad2 Mon Sep 17 00:00:00 2001
From: stevesmiles <53028092+stevesmiles@users.noreply.github.com>
Date: Thu, 18 Jul 2019 15:12:34 -0400
Subject: [PATCH] Update ScintillaWin.cxx

---
 scintilla/win32/ScintillaWin.cxx | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/scintilla/win32/ScintillaWin.cxx b/scintilla/win32/ScintillaWin.cxx
index 1d54f2d72..0a3437136 100644
--- a/scintilla/win32/ScintillaWin.cxx
+++ b/scintilla/win32/ScintillaWin.cxx
@@ -1447,6 +1447,15 @@ sptr_t ScintillaWin::WndProc(unsigned int iMessage, uptr_t wParam, sptr_t lParam
 
 			// Either SCROLL or ZOOM. We handle the wheel steppings calculation
 			wheelDelta -= GET_WHEEL_DELTA_WPARAM(wParam);
+
+			// Hold RIGHT MOUSE BUTTON and SCROLL to cycle through UNDO history
+			if (wParam & MK_RBUTTON) {
+				if (wheelDelta >= 0)
+					Redo();
+				else
+					Undo();
+			}
+
 			if (std::abs(wheelDelta) >= WHEEL_DELTA && linesPerScroll > 0) {
 				Sci::Line linesToScroll = linesPerScroll;
 				if (linesPerScroll == WHEEL_PAGESCROLL)