From 7065e0bf25484fe9cf008c934b69eff90600d3d8 Mon Sep 17 00:00:00 2001
From: Ulrich Sibiller <uli42@gmx.de>
Date: Sun, 19 Mar 2017 21:59:17 +0100
Subject: Keystroke.c: ignore CapsLock and NumLock most of the time

CapsLock and NumLock will only be taken into account for keystrokes
that explicitly require them. This is implemented for convenience and
fixes ArcticaProject/nx-libs#397
---
 nx-X11/programs/Xserver/hw/nxagent/Keyboard.c  | 22 +++++++++++++++++++---
 nx-X11/programs/Xserver/hw/nxagent/Keyboard.h  |  3 +++
 nx-X11/programs/Xserver/hw/nxagent/Keystroke.c | 10 ++++++++++
 3 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/nx-X11/programs/Xserver/hw/nxagent/Keyboard.c b/nx-X11/programs/Xserver/hw/nxagent/Keyboard.c
index 5fc01c976..02b60bef4 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Keyboard.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/Keyboard.c
@@ -204,8 +204,10 @@ static char *nxagentXkbGetRules(void);
 unsigned int nxagentAltMetaMask;
 unsigned int nxagentAltMask;
 unsigned int nxagentMetaMask;
+unsigned int nxagentCapsMask;
+unsigned int nxagentNumlockMask;
 
-static void nxagentCheckAltMetaKeys(CARD8, int);
+static void nxagentCheckModifierMasks(CARD8, int);
 
 CARD8 nxagentCapsLockKeycode = 66;
 CARD8 nxagentNumLockKeycode  = 77;
@@ -792,6 +794,8 @@ N/A
       nxagentAltMetaMask = 0;
       nxagentAltMask = 0;
       nxagentMetaMask = 0;
+      nxagentCapsMask = 0;
+      nxagentNumlockMask = 0;
 
       for (i = 0; i < 256; i++)
         modmap[i] = 0;
@@ -805,7 +809,7 @@ N/A
 
           if (keycode > 0)
           {
-            nxagentCheckAltMetaKeys(keycode, j);
+            nxagentCheckModifierMasks(keycode, j);
           }
         }
       XFreeModifiermap(modifier_keymap);
@@ -1377,7 +1381,7 @@ int nxagentResetKeyboard(void)
   }
 }
 
-void nxagentCheckAltMetaKeys(CARD8 keycode, int j)
+void nxagentCheckModifierMasks(CARD8 keycode, int j)
 {
   if (keycode == XKeysymToKeycode(nxagentDisplay, XK_Meta_L))
   {
@@ -1402,6 +1406,18 @@ void nxagentCheckAltMetaKeys(CARD8 keycode, int j)
     nxagentAltMetaMask |= 1 << j;
     nxagentAltMask |= 1 << j;
   }
+
+  if (keycode == XKeysymToKeycode(nxagentDisplay, XK_Num_Lock))
+  {
+    nxagentNumlockMask |= 1 << j;
+  }
+
+  if (keycode == XKeysymToKeycode(nxagentDisplay, XK_Caps_Lock) ||
+      keycode == XKeysymToKeycode(nxagentDisplay, XK_Shift_Lock) )
+  {
+    nxagentCapsMask |= 1 << j;
+  }
+
 }
 
 void nxagentCheckRemoteKeycodes()
diff --git a/nx-X11/programs/Xserver/hw/nxagent/Keyboard.h b/nx-X11/programs/Xserver/hw/nxagent/Keyboard.h
index 368d5d843..d4f30fa6c 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Keyboard.h
+++ b/nx-X11/programs/Xserver/hw/nxagent/Keyboard.h
@@ -126,4 +126,7 @@ CARD8 nxagentConvertKeycode(CARD8 k);
 extern CARD8 nxagentCapsLockKeycode;
 extern CARD8 nxagentNumLockKeycode;
 
+extern unsigned int nxagentCapsMask;
+extern unsigned int nxagentNumlockMask;
+
 #endif /* __Keyboard_H__ */
diff --git a/nx-X11/programs/Xserver/hw/nxagent/Keystroke.c b/nx-X11/programs/Xserver/hw/nxagent/Keystroke.c
index d12b459fc..69b07dfe5 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Keystroke.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/Keystroke.c
@@ -34,6 +34,7 @@
 #include "Events.h"
 #include "Options.h"
 #include "Keystroke.h"
+#include "Keyboard.h"
 #include "Drawable.h"
 #include "Init.h" /* extern int nxagentX2go */
 
@@ -149,6 +150,15 @@ static Bool modifier_matches(unsigned int mask, int compare_alt_meta, unsigned i
     state &= ~nxagentAltMetaMask;
   }
 
+  /* ignore CapsLock and/or Numlock if the keystroke does not
+     explicitly require them */
+
+  if ( !(mask & nxagentCapsMask) )
+    state &= ~nxagentCapsMask;
+
+  if ( !(mask & nxagentNumlockMask) )
+    state &= ~nxagentNumlockMask;
+
   /* all modifiers except meta/alt have to match exactly, extra bits are evil */
   if (mask != state) {
     ret = False;
-- 
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