MusicPal: Restore display size after invalidation

Index: b/hw/musicpal.c
===================================================================
@@ -759,6 +759,7 @@ typedef struct musicpal_lcd_state {
     int page_off;
     DisplayState *ds;
     uint8_t video_ram[128*64/8];
+    int resize;
 } musicpal_lcd_state;
 
 static uint32_t lcd_brightness;

@@ -817,6 +818,11 @@ static void lcd_refresh(void *opaque)
     musicpal_lcd_state *s = opaque;
     int x, y, col;
 
+    if (s->resize) {
+        dpy_resize(s->ds, 128*3, 64*3);
+        s->resize = 0;
+    }
+
     switch (s->ds->depth) {
     case 0:
         return;

@@ -843,6 +849,13 @@ static void lcd_refresh(void *opaque)
     dpy_update(s->ds, 0, 0, 128*3, 64*3);
 }
 
+static void lcd_invalidate(void *opaque)
+{
+    musicpal_lcd_state *s = opaque;
+
+    s->resize = 1;
+}
+
 static uint32_t musicpal_lcd_read(void *opaque, target_phys_addr_t offset)
 {
     musicpal_lcd_state *s = opaque;

@@ -919,12 +932,12 @@ static void musicpal_lcd_init(DisplaySta
         return;
     s->base = base;
     s->ds = ds;
+    s->resize = 1;
     iomemtype = cpu_register_io_memory(0, musicpal_lcd_readfn,
                                        musicpal_lcd_writefn, s);
     cpu_register_physical_memory(base, MP_LCD_SIZE, iomemtype);
 
-    graphic_console_init(ds, lcd_refresh, NULL, NULL, NULL, s);
-    dpy_resize(ds, 128*3, 64*3);
+    graphic_console_init(ds, lcd_refresh, lcd_invalidate, NULL, NULL, s);
 }
 
 /* PIC register offsets */