fix heuristics for focusing windows after hiding or deleting current

client.c

@@ -414,4 +414,25 @@ void ensureactive() {
 void ensureactiveonmonitor(int monitor) {
   if (!current)
     shuffleonmonitor(monitor);
+}
+
+Window getrevert(Client* c) {
+  int m;
+  Client* cc;
+
+  if (!c) {
+    return 0;
+  }
+
+  if (c->trans) {
+    return c->trans;
+  } else {
+    m = getmonitorbyclient(c);
+    for (cc = c->revert; cc && cc->revert; cc = cc->revert) {
+      if (getmonitorbyclient(cc) == m) {
+        return cc->window;
+      }
+    }
+  }
+  return 0;
 }

event.c

@@ -255,14 +255,15 @@ void mapreq(XMapRequestEvent* e) {
 }
 
 void unmap(XUnmapEvent* e) {
-  Client* c;
+  Client *c, *revertc;
-  int monitor;
+  Window revert;
+  int m;
 
   curtime = CurrentTime;
   c = getclient(e->window, 0);
 
   if (c) {
-    monitor = getmonitorbyclient(c);
+    m = getmonitorbyclient(c);
     switch (c->state) {
       case IconicState:
         if (e->send_event) {
@@ -271,8 +272,14 @@ void unmap(XUnmapEvent* e) {
         }
         break;
       case NormalState:
-        if (c == current)
+        if (c == current) {
-          shuffleonmonitor(monitor);
+          if (revertc = getclient(getrevert(c), 0)) {
+            top(revertc);
+            active(revertc);
+          } else {
+            shuffleonmonitor(m);
+          }
+        }
         if (!c->reparenting)
           withdraw(c);
         break;
@@ -345,7 +352,8 @@ void newwindow(XCreateWindowEvent* e) {
 
 void destroy(Window w) {
   int i;
-  Client* c;
+  Client *c, *revertc;
+  Window revert;
   int monitor;
 
   curtime = CurrentTime;
@@ -353,14 +361,20 @@ void destroy(Window w) {
   if (c == 0)
     return;
 
+  revert = getrevert(c);
   monitor = getmonitorbyclient(c);
+
   if (numvirtuals > 1)
     for (i = 0; i < numvirtuals; i++)
       if (currents[i] == c)
         currents[i] = 0;
 
   rmclient(c);
-  ensureactiveonmonitor(monitor);
+
+  if (!current && (revertc = getclient(revert, 0))) {
+    top(revertc);
+    active(revertc);
+  }
 
   /* flush any errors generated by the window's sudden demise */
   ignore_badwindow = 1;
@@ -383,8 +397,10 @@ void clientmesg(XClientMessageEvent* e) {
     perror("ryudo: exec failed");
     exit(1);
   }
-  if (e->message_type == wm_protocols)
+
+  if (e->message_type == wm_protocols) {
     return;
+  }
   if (e->message_type == wm_change_state) {
     c = getclient(e->window, 0);
     if (e->format == 32 && e->data.l[0] == IconicState && c != 0) {

fns.h

@@ -103,6 +103,7 @@ int isterminalwindow(Client* c);
 void ensureactive();
 void ensureactiveonmonitor(int);
 void shuffleonmonitor(int);
+Window getrevert(Client*);
 
 /* grab.c */
 int menuhit();

menu.c

@@ -310,19 +310,30 @@ void move(Client* c, int but) {
 }
 
 void delete (Client* c, int shift) {
-  // int v;
+  Client* revertc;
+
   if (c == 0)
     return;
-  // v = c->virt;
+
+  if (c == current) {
+    if (revertc = getclient(getrevert(c), 0)) {
+      top(revertc);
+      active(revertc);
+    } else {
+      nofocus();
+    }
+  }
+
   if ((c->proto & Pdelete) && !shift)
     sendcmessage(c->window, wm_protocols, wm_delete, 0, 0);
   else
     XKillClient(dpy, c->window); /* let event clean up */
-  ensureactive();
 }
 
 void hide(Client* c) {
   int monitor;
+  Client* revertc;
+
   if (c == 0 || numhidden == MAXHIDDEN)
     return;
   if (hidden(c)) {
@@ -333,8 +344,14 @@ void hide(Client* c) {
   XUnmapWindow(dpy, c->parent);
   XUnmapWindow(dpy, c->window);
   setstate(c, IconicState);
-  if (c == current)
+  if (c == current) {
-    nofocus();
+    if (revertc = getclient(getrevert(c), 0)) {
+      top(revertc);
+      active(revertc);
+    } else {
+      nofocus();
+    }
+  }
   if (reversehide) {
     memmove(hiddenc + 1, hiddenc, numhidden * sizeof hiddenc[0]);
     memmove(