fix the ultimate bug when restarting awesome, client misdisplayed

client.c

@@ -207,12 +207,10 @@ updatetitle(Client * c)
 void
 ban(Client * c)
 {
-    if(c->isbanned)
-        return;
     XUnmapWindow(c->display, c->win);
     setclientstate(c, IconicState);
     c->isbanned = True;
-    c->unmapped++;
+    c->unmapped = True;
 }
 
 /** Configure client
@@ -550,11 +548,10 @@ saveprops(Client * c, int ntags)
 void
 unban(Client * c)
 {
-    if(!c->isbanned)
-        return;
     XMapWindow(c->display, c->win);
     setclientstate(c, NormalState);
     c->isbanned = False;
+    c->unmapped = False;
 }
 
 void
@@ -562,6 +559,7 @@ unmanage(Client * c, DC *drawcontext, long state, awesome_config *awesomeconf)
 {
     XWindowChanges wc;
 
+    c->unmapped = True;
     wc.border_width = c->oldborder;
     /* The server grab construct avoids race conditions. */
     XGrabServer(c->display);

client.h

@@ -38,7 +38,7 @@ struct Client
     int rx, ry, rw, rh;
     int basew, baseh, incw, inch, maxw, maxh, minw, minh;
     int minax, maxax, minay, maxay;
-    int unmapped;
+    Bool unmapped;
     long flags;
     int border, oldborder;
     Bool isbanned, isfixed, ismax, isfloating, wasfloating;

event.c

@@ -429,7 +429,7 @@ handle_event_unmapnotify(XEvent * e, awesome_config *awesomeconf)
     XUnmapEvent *ev = &e->xunmap;
 
     if((c = getclient(ev->window))
-       && ev->event == RootWindow(e->xany.display, c->screen) && (ev->send_event || !c->unmapped--))
+       && ev->event == RootWindow(e->xany.display, c->screen) && (ev->send_event || !c->unmapped))
         unmanage(c, &dc[c->screen], WithdrawnState, &awesomeconf[c->screen]);
 }