From f4a6c20f464df79a9b15b4a2a11daaa7a06c60a0 Mon Sep 17 00:00:00 2001
From: Christoph Lohmann <20h@r-36.net>
Date: Sat, 16 Feb 2013 13:57:12 +0100
Subject: Adding a way to ignore bits in the state.

---
 config.def.h | 6 ++++++
 st.c         | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/config.def.h b/config.def.h
index 93fc26d..07a22ed 100644
--- a/config.def.h
+++ b/config.def.h
@@ -104,6 +104,12 @@ static Shortcut shortcuts[] = {
  */
 static KeySym mappedkeys[] = { -1 };
 
+/*
+ * Which bits of the state should be ignored. By default the state bit for the
+ * keyboard layout (XK_SWITCH_MOD) is ignored.
+ */
+uint ignoremod = XK_SWITCH_MOD;
+
 /* key, mask, output, keypad, cursor, crlf */
 static Key key[] = {
 	/* keysym             mask         string         keypad cursor crlf */
diff --git a/st.c b/st.c
index 0ae2c90..64366af 100644
--- a/st.c
+++ b/st.c
@@ -61,6 +61,7 @@
 #define DRAW_BUF_SIZ  20*1024
 #define XK_ANY_MOD    UINT_MAX
 #define XK_NO_MOD     0
+#define XK_SWITCH_MOD (1<<13)
 
 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
 
@@ -3008,6 +3009,8 @@ focus(XEvent *ev) {
 
 inline bool
 match(uint mask, uint state) {
+	state &= ~(ignoremod);
+
 	if(mask == XK_NO_MOD && state)
 		return false;
 	if(mask != XK_ANY_MOD && mask != XK_NO_MOD && !state)
-- 
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