Fixed KBM interaction with Shortcut Guide (#2220)

src/common/common.vcxproj

@@ -124,6 +124,7 @@
     <ClInclude Include="keyboard_layout.h" />
     <ClInclude Include="keyboard_layout_impl.h" />
     <ClInclude Include="notifications.h" />
+    <ClInclude Include="shared_constants.h" />
     <ClInclude Include="timeutil.h" />
     <ClInclude Include="VersionHelper.h" />
     <ClInclude Include="window_helpers.h" />

src/common/common.vcxproj.filters

@@ -99,6 +99,9 @@
     <ClInclude Include="com_object_factory.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="shared_constants.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
     <ClInclude Include="keyboard_layout_impl.h">
       <Filter>Header Files</Filter>
     </ClInclude>

src/common/shared_constants.h

@@ -0,0 +1,8 @@
+#pragma once
+#include "common.h"
+
+namespace CommonSharedConstants
+{
+    // Flag that can be set on an input event so that it is ignored by Keyboard Manager
+    const ULONG_PTR KEYBOARDMANAGER_INJECTED_FLAG = 0x1;
+}