Solving issue #12.

src/common.hh

@@ -82,10 +82,12 @@ public:
 	bool _deserialized;
 	std::string _title;
 	std::string _class_name;
+	bool _erase;
 
 	win_t ()
 		: _hwnd{},
-		  _deserialized{}
+		  _deserialized{},
+		  _erase{}
 	{}
 	~win_t ()
 	{

src/poshandler.cc

@@ -158,6 +158,39 @@ namespace mcm {
 		}
 	}
 
+	bool poshandler::window_exist (HWND & hwnd)
+	{
+		return _windows.find(hwnd) != _windows.end();
+	}
+
+	void poshandler::remove_window (HWND & hwnd)
+	{
+	}
+
+	void poshandler::uniform_windows (poshandler & pos)
+	{
+		if (_clearing)
+			return;
+		_clearing = true;
+		for (auto & item : _windows) {
+			if (! pos.window_exist(item.second._hwnd)) {
+				item.second._erase = true;
+			}
+		}
+		mapwin_t::iterator b = _windows.begin();
+		mapwin_t::iterator e = _windows.end();
+
+		for ( ; b != e; ) {
+			if (b->second._erase) {
+				logp (sys::e_debug, "Deleting windows '"
+					  << b->second._class_name
+					  << "', because deleted in other config.");
+				_windows.erase (b++);
+			} else {
+				++b;
+			}
+		}
+	}
 	void poshandler::uniform_windows ()
 	{
 		if (_clearing)

src/poshandler.hh

@@ -38,6 +38,9 @@ namespace mcm {
 		void get_windows ();
 		void save_configuration (std::string file_name);
 		void load_configuration (std::string file_name);
+		bool window_exist (HWND & hwnd);
+		void remove_window (HWND & hwnd);
+		void uniform_windows (poshandler & pos);
 		void uniform_windows ();
 
 		static bool get_class_name (HWND hwnd, LPSTR buf, INT buf_size);

src/window.hh

@@ -301,6 +301,13 @@ namespace mcm {
 					config_name += "_";
 					config_name += sys::itoa(d.monitors());
 					if (_repos.find(config_name) != _repos.end()) {
+						poshandler & repo = _repos[config_name];
+						logp (sys::e_debug, "Uniforming windows: '"
+							  << config_name << "'.");
+						for (auto & r : _repos) {
+							if (r.first != config_name)
+								r.second.uniform_windows (repo);
+						}
 						logp (sys::e_debug, "Repositioning windows: '"
 							  << config_name << "'.");
 						_repos[config_name].reposition ();