Problems on first start. fixes #208 (#210)

- Image not visible until fit / fixed button press
- Help screen shows without button highlighted

src/main.rs

@@ -161,6 +161,7 @@ fn main() {
         });
     }
     let help_visible = Cell::new(first_launch);
+    bottom_bar.set_help_visible(help_visible.get());
     help_screen.set_visible(help_visible.get());
     {
         let help_screen = help_screen;

src/widgets/picture_widget.rs

@@ -400,6 +400,7 @@ impl PictureWidgetData {
     pub fn set_img_size_to_orig(&mut self) {
         self.img_texel_size = 1.0;
         self.scaling = ScalingMode::Fixed;
+        self.config.lock().unwrap().set_scaling(self.scaling);
         self.update_scaling_buttons();
         self.render_validity.invalidate();
     }
@@ -519,7 +520,7 @@ impl PictureWidget {
 
             program,
             bright_shade: 0.95,
-            img_texel_size: 0.0,
+            img_texel_size: 1.0,
             scaling,
             img_pos: Default::default(),
             antialiasing,