GUI: Autofocus newly opened GUIModalMenu instances

This in particular fixes incorrect event propagation to menus that
are no longer shown, such as the key change menu when opened within
the settings tab.

src/gui/guiChatConsole.cpp

@@ -114,7 +114,6 @@ void GUIChatConsole::openConsole(f32 scale)
 	reformatConsole();
 	m_animate_time_old = porting::getTimeMs();
 	IGUIElement::setVisible(true);
-	Environment->setFocus(this);
 	m_menumgr->createdMenu(this);
 }
 

src/gui/mainmenumanager.h

@@ -57,15 +57,18 @@ class MainMenuManager : public IMenuManager
 		if(!m_stack.empty())
 			m_stack.back()->setVisible(false);
 		m_stack.push_back(menu);
+		guienv->setFocus(m_stack.back());
 	}
 
 	virtual void deletingMenu(gui::IGUIElement *menu)
 	{
 		// Remove all entries if there are duplicates
 		m_stack.remove(menu);
 
-		if(!m_stack.empty())
+		if(!m_stack.empty()) {
 			m_stack.back()->setVisible(true);
+			guienv->setFocus(m_stack.back());
+		}
 	}
 
 	// Returns true to prevent further processing

src/gui/modalMenu.cpp

@@ -49,7 +49,6 @@ GUIModalMenu::GUIModalMenu(gui::IGUIEnvironment* env, gui::IGUIElement* parent,
 #endif
 
 	setVisible(true);
-	Environment->setFocus(this);
 	m_menumgr->createdMenu(this);
 
 	m_doubleclickdetect[0].time = 0;