Fix bug causing random frames to float when toggling between managed/floating layer.

cmd/wmii/_util.c

@@ -125,7 +125,7 @@ spawn3l(int fd[3], const char *file, ...) {
 }
 
 void
-backtrace(void) {
+backtrace(char *btarg) {
 	char *proc, *spid;
 	int fd[3], p[2], q[2];
 	int pid, status, n;
@@ -153,7 +153,7 @@ backtrace(void) {
 	if(spawn3l(fd, "gdb", "gdb", "-batch", "-x", "/dev/fd/0", proc, spid, nil) < 0)
 		exit(1);
 
-	fprint(p[1], "bt full\n");
+	fprint(p[1], "bt %s\n", btarg);
 	fprint(p[1], "detach\n");
 	close(p[1]);
 

cmd/wmii/area.c

@@ -191,11 +191,8 @@ area_attach(Area *a, Frame *f) {
 
 	view_arrange(a->view);
 
-	if(a->frame && a->sel == nil) {
-		fprint(2, "a->sel == nil\n");
-		backtrace();
+	if(btassert("4 full", a->frame && a->sel == nil))
 		a->sel = a->frame;
-	}
 }
 
 void

cmd/wmii/column.c

@@ -164,6 +164,12 @@ column_scale(Area *a) {
 			nuncol++;
 	}
 
+	/* FIXME: Kludge. */
+	dy = Dy(a->view->r) - Dy(a->r);
+	minh = colh * (ncol + nuncol - 1) + uncolh;
+	if(dy && Dy(a->r) < minh)
+		a->r.max.y += min(dy, minh - Dy(a->r));
+
 	surplus = Dy(a->r)
 		- (ncol * colh)
 		- (nuncol * uncolh);

cmd/wmii/fns.h

@@ -12,6 +12,9 @@
 # pragma varargck	type	"r"	void
 #endif
 
+#define btassert(arg, cond) \
+	(cond ? fprint(1, __FILE__":%d: failed assertion: " #cond "\n", __LINE__), backtrace(arg), true : false)
+
 /* area.c */
 void	area_attach(Area*, Frame*);
 Area*	area_create(View*, Area *pos, uint w);
@@ -226,7 +229,7 @@ void	view_update_rect(View*);
 Rectangle*	view_rects(View*, uint *num, Frame *ignore);
 
 /* _util.c */
-void	backtrace(void);
+void	backtrace(char*);
 void	closeexec(int);
 char**	comm(int, char**, char**);
 int	doublefork(void);

cmd/wmii/frame.c

@@ -300,9 +300,8 @@ frame_resize(Frame *f, Rectangle r) {
 	Rectangle fr, cr;
 	int collapsed, dx;
 
-	if(Dx(r) <= 0 || Dy(r) <= 0) {
+	if(btassert("4 full", Dx(r) <= 0 || Dy(r) <= 0)) {
 		fprint(2, "Frame rect: %R\n", r);
-		backtrace();
 		r.max.x = min(r.min.x+1, r.max.x);
 		r.max.y = min(r.min.y+1, r.max.y);
 	}