Add UI button to stop a game.

This adds a button along side the kick/kickban/ban buttons to stop the game the selected user is in.

Fixes #3635

data/gui/window/lobby_player_info.cfg

@@ -170,7 +170,7 @@
 											horizontal_alignment = "left"
 
 											[label]
-												label = _ "Kick / ban reason:"
+												label = _ "Reason:"
 											[/label]
 										[/column]
 
@@ -262,6 +262,18 @@
 												label = _ "Kick + Ban"
 											[/button]
 										[/column]
+
+										[column]
+											grow_factor = 0
+											border = "all"
+											border_size = 5
+
+											[button]
+												definition = "default"
+												id = "stopgame"
+												label = _ "Stop Game"
+											[/button]
+										[/column]
 									[/row]
 
 								[/grid]

src/gui/dialogs/multiplayer/player_info.cpp

@@ -96,6 +96,12 @@ void lobby_player_info::pre_show(window& window)
 						this,
 						std::ref(window)));
 
+	connect_signal_mouse_left_click(
+			find_widget<button>(&window, "stopgame", false),
+			std::bind(&lobby_player_info::stopgame_button_callback,
+						this,
+						std::ref(window)));
+
 	find_widget<label>(&window, "player_name", false).set_label(info_.name);
 
 	std::stringstream loc;
@@ -204,6 +210,23 @@ void lobby_player_info::kick_ban_button_callback(window& w)
 	w.close();
 }
 
+void lobby_player_info::stopgame_button_callback(window& w)
+{
+	do_stopgame();
+	w.close();
+}
+
+void lobby_player_info::do_stopgame()
+{
+	std::stringstream ss;
+	ss << "stopgame " << info_.name;
+	if(!reason_->get_value().empty()) {
+		ss << " " << reason_->get_value();
+	}
+
+	chat_.send_command("query", ss.str());
+}
+
 void lobby_player_info::do_kick_ban(bool ban)
 {
 	std::stringstream ss;

src/gui/dialogs/multiplayer/player_info.hpp

@@ -68,6 +68,10 @@ class lobby_player_info : public modal_dialog
 
 	void kick_ban_button_callback(window& w);
 
+	void stopgame_button_callback(window& w);
+
+	void do_stopgame();
+
 	void do_kick_ban(bool ban);
 
 	events::chat_handler& chat_;