commit f4a6c20f464df79a9b15b4a2a11daaa7a06c60a0
from: Christoph Lohmann <20h@r-36.net>
date: Sat Feb 16 12:57:12 2013 UTC

Adding a way to ignore bits in the state.

commit - e0ec2cf984ff8006b99cf4ca8590ceec7113daac
commit + f4a6c20f464df79a9b15b4a2a11daaa7a06c60a0
blob - 93fc26d650e11f32dafb84cda6609cb983eaa708
blob + 07a22ed9610a731ebf043385e3ed653d7fc86902
--- config.def.h
+++ 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 */
blob - 0ae2c90b3b38f9f2d8878f2f272eeb0dbd3e7028
blob + 64366afb3e9393613db1460faed9c5bd9090c05c
--- st.c
+++ 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)