added readme and safeguard in desktop_del

Author: henkman

README.md

@@ -1,4 +1,14 @@
 virgo
 =====
 
-Virtual Desktop for Windows
+Virtual Desktop Manager for Windows
+
+Hotkeys:
+
+        ALT + 1..4             -> changes to desktop 1..4
+        CTRL + 1..4            -> moves active window to desktop 1..4
+        ALT + CTRL + SHIFT + Q -> exits the program
+
+build with
+
+        $ make

virgo.c

@@ -47,13 +47,16 @@ static void desktop_add(desktop_t *desk, HWND hwnd)
 
 static void desktop_del(desktop_t *desk, HWND hwnd)
 {
-	int i, o = 0;
+	int i, o = -1;
 	for(i = 0; i < desk->wincount; i++) {
 		if(desk->windows[i] == hwnd) {
 			o = i;
 			break;
 		}
 	}
+	if(o == -1) {
+		return;
+	}
 	for(i = o; i < (desk->wincount - 1); i++) {
 		desk->windows[i] = desk->windows[i + 1];
 	}