M src/Remember.cc → src/Remember.cc

@@ -965,7 +965,8 @@ 
     // first, set the options that aren't preserved as window properties on
     // restart, then return if fluxbox is starting up -- we want restart to
     // disturb the current window state as little as possible
-    if (app->is_grouped && app->group == 0)
+    Window leftwin = winclient.getGroupLeftWindow();
+    if (app->is_grouped && app->group == 0 && leftwin == None)
         app->group = &win;
 
     if (app->focushiddenstate_remember)

M src/Screen.cc → src/Screen.cc

@@ -2073,11 +2073,9 @@ // yay, this'll do.
     WinClient *other = it->second;
     m_expecting_groups.erase(it); // don't expect it anymore
 
-    // forget about it if it isn't the left-most client in the group, plus
-    // it must have the atom set on it (i.e. previously encountered by fluxbox)
-    // for us to check our expecting
-    if (!winclient.hasGroupLeftWindow() ||
-        other->getGroupLeftWindow() != None)
+    // forget about it if it isn't the left-most client in the group
+    Window leftwin = other->getGroupLeftWindow();
+    if (leftwin != None && leftwin != winclient.window())
         return 0;
 
     return other;

M src/Window.cc → src/Window.cc

@@ -386,7 +386,8 @@ m_old_pos_x = 0;
 
     assert(m_client);
     m_client->setFluxboxWindow(this);
-    m_client->setGroupLeftWindow(None); // nothing to the left.
+    if (!m_client->hasGroupLeftWindow())
+        m_client->setGroupLeftWindow(None); // nothing to the left.
 
     // check for shape extension and whether the window is shaped
     m_shaped = false;