Use MainWindow::instance() instead of mainWindow global var

radio/src/thirdparty/libopenui/src/keyboard_base.h

@@ -22,7 +22,8 @@
 #include "mainwindow.h"
 #include "form.h"
 
-class Keyboard: public FormWindow {
+class Keyboard: public FormWindow
+{
   public:
     explicit Keyboard(coord_t height):
       FormWindow(nullptr, {0, LCD_H - height, LCD_W, height}, OPAQUE)
@@ -50,7 +51,7 @@ class Keyboard: public FormWindow {
         activeKeyboard->clearField();
       }
       activeKeyboard = this;
-      attach(&mainWindow);
+      attach(MainWindow::instance());
       fieldContainer = getFieldContainer(newField);
       fieldContainer->setHeight(LCD_H - height() - fieldContainer->top());
       fieldContainer->scrollTo(newField);

radio/src/thirdparty/libopenui/src/mainwindow.cpp

@@ -24,7 +24,7 @@
 #include "touch.h"
 #endif
 
-MainWindow mainWindow;
+MainWindow * MainWindow::_instance = nullptr;
 
 #if defined(HARDWARE_TOUCH)
 TouchState touchState;

radio/src/thirdparty/libopenui/src/mainwindow.h

@@ -31,6 +31,7 @@ class MainWindow: public Window
       invalidatedRect(rect)
     {
       Layer::push(this);
+      _instance = this;
     }
 
     ~MainWindow() override
@@ -38,6 +39,11 @@ class MainWindow: public Window
       children.clear();
     }
 
+    static MainWindow * instance()
+    {
+      return _instance;
+    }
+
 #if defined(DEBUG_WINDOWS)
     std::string getName() const override
     {
@@ -64,10 +70,8 @@ class MainWindow: public Window
     void run(bool trash=true);
 
   protected:
+    static MainWindow * _instance;
     static void emptyTrash();
     rect_t invalidatedRect;
     const char * shutdown = nullptr;
 };
-
-extern MainWindow mainWindow;
-