From 68557afff29ef8c5e8cd8fb7ad55e9e5f7f8b32d Mon Sep 17 00:00:00 2001
From: Nick Bolton <nick@synergy-project.org>
Date: Mon, 31 Mar 2014 15:54:57 +0000
Subject: [PATCH] fixed: modifier keys are repeated on windows server.

---
 src/lib/platform/MSWindowsScreen.cpp | 33 ++++++++++++++++++++++++++++
 src/lib/platform/MSWindowsScreen.h   |  4 ++++
 2 files changed, 37 insertions(+)

diff --git a/src/lib/platform/MSWindowsScreen.cpp b/src/lib/platform/MSWindowsScreen.cpp
index 714f743e..3422fd03 100644
--- a/src/lib/platform/MSWindowsScreen.cpp
+++ b/src/lib/platform/MSWindowsScreen.cpp
@@ -1136,6 +1136,11 @@ CMSWindowsScreen::onKey(WPARAM wParam, LPARAM lParam)
 		}
 	}
 
+	// stop sending modifier keys over and over again
+	if (isModifierRepeat(oldState, state, wParam)) {
+		return true;
+	}
+
 	// ignore message if posted prior to last mark change
 	if (!ignore()) {
 		// check for ctrl+alt+del.  we do not want to pass that to the
@@ -1816,3 +1821,31 @@ CMSWindowsScreen::getDropTarget() const
 {
 	return m_desktopPath;
 }
+
+bool
+CMSWindowsScreen::isModifierRepeat(KeyModifierMask oldState, KeyModifierMask state, WPARAM wParam) const
+{
+	bool result = false;
+
+	if (oldState == state && state != 0) {
+		UINT virtKey = (wParam & 0xffu);
+		if ((state & KeyModifierShift) != 0
+			&& (virtKey == VK_LSHIFT || virtKey == VK_RSHIFT)) {
+			result = true;
+		}
+		if ((state & KeyModifierControl) != 0
+			&& (virtKey == VK_LCONTROL || virtKey == VK_RCONTROL)) {
+			result = true;
+		}
+		if ((state & KeyModifierAlt) != 0
+			&& (virtKey == VK_LMENU || virtKey == VK_RMENU)) {
+			result = true;
+		}
+		if ((state & KeyModifierSuper) != 0
+			&& (virtKey == VK_LWIN || virtKey == VK_RWIN)) {
+			result = true;
+		}
+	}
+
+	return result;
+}
diff --git a/src/lib/platform/MSWindowsScreen.h b/src/lib/platform/MSWindowsScreen.h
index 2df94811..4350cd7f 100644
--- a/src/lib/platform/MSWindowsScreen.h
+++ b/src/lib/platform/MSWindowsScreen.h
@@ -211,6 +211,10 @@ private: // HACK
 	
 	// save last position of mouse to compute next delta movement
 	void saveMousePosition(SInt32 x, SInt32 y);
+	
+	// check if it is a modifier key repeating message
+	bool				isModifierRepeat(KeyModifierMask oldState, 
+							KeyModifierMask state, WPARAM wParam) const;
 
 private:
 	struct CHotKeyItem {