From c2eea4bde05856d630e935f26d39b1d8ae862514 Mon Sep 17 00:00:00 2001
From: Eric Rybicki <info@ericrybicki.com>
Date: Mon, 18 May 2020 14:47:54 +0200
Subject: [PATCH] Fix certain characters being recognized as special keys in
 Windows when using the us international layout

(cherry picked from commit e460456e60b5129f89b4647d8bbb9c71a294c1ca)
---
 platform/windows/key_mapping_windows.cpp | 13 +++++++++++++
 platform/windows/key_mapping_windows.h   |  1 +
 platform/windows/os_windows.cpp          |  3 ++-
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/platform/windows/key_mapping_windows.cpp b/platform/windows/key_mapping_windows.cpp
index 6bf8a70d0f3..58daa220aea 100644
--- a/platform/windows/key_mapping_windows.cpp
+++ b/platform/windows/key_mapping_windows.cpp
@@ -251,3 +251,16 @@ unsigned int KeyMappingWindows::get_keysym(unsigned int p_code) {
 
 	return KEY_UNKNOWN;
 }
+
+bool KeyMappingWindows::is_extended_key(unsigned int p_code) {
+	return p_code == VK_INSERT ||
+		   p_code == VK_DELETE ||
+		   p_code == VK_HOME ||
+		   p_code == VK_END ||
+		   p_code == VK_PRIOR ||
+		   p_code == VK_NEXT ||
+		   p_code == VK_LEFT ||
+		   p_code == VK_UP ||
+		   p_code == VK_RIGHT ||
+		   p_code == VK_DOWN;
+}
diff --git a/platform/windows/key_mapping_windows.h b/platform/windows/key_mapping_windows.h
index 0f9bdecde1e..5f2ea68ef25 100644
--- a/platform/windows/key_mapping_windows.h
+++ b/platform/windows/key_mapping_windows.h
@@ -43,6 +43,7 @@ class KeyMappingWindows {
 
 public:
 	static unsigned int get_keysym(unsigned int p_code);
+	static bool is_extended_key(unsigned int p_code);
 };
 
 #endif // KEY_MAPPING_WINDOWS_H
diff --git a/platform/windows/os_windows.cpp b/platform/windows/os_windows.cpp
index 3eb953ecd04..eca5be4e498 100755
--- a/platform/windows/os_windows.cpp
+++ b/platform/windows/os_windows.cpp
@@ -1216,7 +1216,8 @@ void OS_Windows::process_key_events() {
 		switch (ke.uMsg) {
 
 			case WM_CHAR: {
-				if ((i == 0 && ke.uMsg == WM_CHAR) || (i > 0 && key_event_buffer[i - 1].uMsg == WM_CHAR)) {
+				// extended keys should only be processed as WM_KEYDOWN message.
+				if (!KeyMappingWindows::is_extended_key(ke.wParam) && ((i == 0 && ke.uMsg == WM_CHAR) || (i > 0 && key_event_buffer[i - 1].uMsg == WM_CHAR))) {
 					Ref<InputEventKey> k;
 					k.instance();