Fix and improve BAR_WINTITLEACTIONS_PATCH (#442)

Introduced an unhideall function that can be used to reveal all hidden client in the current view.

Added a change to unmanage to avoid changing the window state from IconicState to WithdrawnState when the window manager stops managing windows (which happens when restarting).

Previously a hidden window would disappear when restarting dwm because:
   - when hidden the window would be unmapped and having the window state of IconicState
   - when restarting the window would remain unmapped while the window state would become WithdrawnState
   - which would prevent the window from being picked up by the scan function when the window manager starts

config.def.h

@@ -1165,6 +1165,7 @@ static const Key keys[] = {
 	#endif // SHIFTSWAPTAGS_PATCH
 	#if BAR_WINTITLEACTIONS_PATCH
 	{ MODKEY|ControlMask,           XK_z,          showhideclient,         {0} },
+	{ MODKEY|ControlMask,           XK_s,          unhideall,              {0} },
 	#endif // BAR_WINTITLEACTIONS_PATCH
 	{ MODKEY|ShiftMask,             XK_c,          killclient,             {0} },
 	#if KILLUNSEL_PATCH

dwm.c

@@ -4572,7 +4572,8 @@ unmanage(Client *c, int destroyed)
 		XSelectInput(dpy, c->win, NoEventMask);
 		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
 		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
-		setclientstate(c, WithdrawnState);
+		if (!HIDDEN(c))
+			setclientstate(c, WithdrawnState);
 		XSync(dpy, False);
 		XSetErrorHandler(xerror);
 		XUngrabServer(dpy);

patch/bar_wintitleactions.c

@@ -92,3 +92,15 @@ showhideclient(const Arg *arg)
 	}
 }
 
+void
+unhideall(const Arg *arg)
+{
+	Client *c = NULL;
+	for (c = selmon->clients; c; c = c->next) {
+		if (ISVISIBLE(c)) {
+			XMapWindow(dpy, c->win);
+			setclientstate(c, NormalState);
+		}
+	}
+	arrange(selmon);
+}

patch/bar_wintitleactions.h

@@ -3,4 +3,5 @@ static void show(Client *c);
 static void togglewin(const Arg *arg);
 static Client * prevtiled(Client *c);
 static void showhideclient(const Arg *arg);
+static void unhideall(const Arg *arg);