bump version to 0.9.2

With this patch, st will reset its window title when an empty string is
given as the terminal title. For example:
	printf "\033]0;\007"

Some applications, like termdown, expect this functionality. xterm
implements it, but it seems that most other terminal emulators don't.
In any case, I don't see why there should ever be a case where the st
window doesn't have a title property.

config.mk

@@ -1,5 +1,5 @@
 # st version
-VERSION = 0.9.1
+VERSION = 0.9.2
 
 # Customize below to fit your system
 

st.c

@@ -86,8 +86,8 @@ enum escape_state {
 
 typedef struct {
 	Glyph attr; /* current char attributes */
-	int x; /* terminal column */
-	int y; /* terminal row */
+	int x;
+	int y;
 	char state;
 } TCursor;
 
@@ -2175,16 +2175,12 @@ tstrsequence(uchar c)
 void
 tcontrolcode(uchar ascii)
 {
-	size_t i;
-
 	switch (ascii) {
 	case '\t':   /* HT */
 		tputtab(1);
 		return;
 	case '\b':   /* BS */
-		for (i = 1; term.c.x && term.line[term.c.y][term.c.x - i].u == 0; ++i)
-			;
-		tmoveto(term.c.x - i, term.c.y);
+		tmoveto(term.c.x-1, term.c.y);
 		return;
 	case '\r':   /* CR */
 		tmoveto(0, term.c.y);

x.c

@@ -1617,6 +1617,9 @@ xseticontitle(char *p)
 	XTextProperty prop;
 	DEFAULT(p, opt_title);
 
+	if (p[0] == '\0')
+		p = opt_title;
+
 	if (Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
 	                                &prop) != Success)
 		return;
@@ -1631,6 +1634,9 @@ xsettitle(char *p)
 	XTextProperty prop;
 	DEFAULT(p, opt_title);
 
+	if (p[0] == '\0')
+		p = opt_title;
+
 	if (Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
 	                                &prop) != Success)
 		return;