Remove window::Mode and introduce Settings::visible

Additionally, only show the window once one frame has been rendered to avoid blank flashes on Windows.

src/window/mode.rs

@@ -1,12 +0,0 @@
-/// The mode of a window-based application.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum Mode {
-    /// The application appears in its own window.
-    Windowed,
-
-    /// The application takes the whole screen of its current monitor.
-    Fullscreen,
-
-    /// The application is hidden
-    Hidden,
-}

src/window/settings.rs

@@ -15,6 +15,9 @@ pub struct Settings {
     /// The maximum size of the window.
     pub max_size: Option<(u32, u32)>,
 
+    /// Whether the window should be visible or not.
+    pub visible: bool,
+
     /// Whether the window should be resizable or not.
     pub resizable: bool,
 
@@ -38,6 +41,7 @@ impl Default for Settings {
             position: Position::default(),
             min_size: None,
             max_size: None,
+            visible: true,
             resizable: true,
             decorations: true,
             transparent: false,
@@ -54,6 +58,7 @@ impl From<Settings> for iced_winit::settings::Window {
             position: iced_winit::Position::from(settings.position),
             min_size: settings.min_size,
             max_size: settings.max_size,
+            visible: settings.visible,
             resizable: settings.resizable,
             decorations: settings.decorations,
             transparent: settings.transparent,