From 7806b24388291a15b5cda04531c23ed417339ab7 Mon Sep 17 00:00:00 2001
From: zeromus <zeromus@users.noreply.github.com>
Date: Sun, 21 Aug 2022 15:35:45 -0400
Subject: [PATCH] winport - fix prefix checking on memwatch addresses (fixes
 #496)

---
 src/drivers/win/window.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/drivers/win/window.cpp b/src/drivers/win/window.cpp
index b3f7d64b..3effd90d 100644
--- a/src/drivers/win/window.cpp
+++ b/src/drivers/win/window.cpp
@@ -3523,9 +3523,10 @@ LRESULT APIENTRY FilterEditCtrlProc(HWND hwnd, UINT msg, WPARAM wP, LPARAM lP)
 
 		case WM_CHAR:
 			{
-				int len = GetWindowTextLength(hwnd);
+				DWORD cpBegin, cpEnd;
+				SendMessage(hwnd, EM_GETSEL, (LPARAM)&cpBegin, (LPARAM)&cpEnd);
 				IsLetterLegalProc isLetterLegal = GetIsLetterLegalProc(GetDlgCtrlID(hwnd));
-				through = IsInputLegal(isLetterLegal, len, wP);
+				through = IsInputLegal(isLetterLegal, (int)cpBegin, wP);
 				if (!through)
 					ShowLetterIllegalBalloonTip(hwnd, isLetterLegal);
 			}