Fix Linux startup theme flash (#195)

src-tauri/capabilities/default.json

@@ -11,6 +11,7 @@
     "core:window:allow-minimize",
     "core:window:allow-toggle-maximize",
     "core:window:allow-close",
+    "core:window:allow-show",
     "core:window:allow-is-maximized",
     "core:window:allow-set-decorations",
     "core:window:allow-is-fullscreen",

src-tauri/src/lib.rs

@@ -313,7 +313,16 @@ pub fn run() {
         }));
 
         builder = builder.plugin(tauri_plugin_updater::Builder::new().build());
-        builder = builder.plugin(tauri_plugin_window_state::Builder::default().build());
+        let window_state_builder = tauri_plugin_window_state::Builder::default();
+        #[cfg(target_os = "linux")]
+        let window_state_builder = window_state_builder.with_state_flags(
+            tauri_plugin_window_state::StateFlags::SIZE
+                | tauri_plugin_window_state::StateFlags::POSITION
+                | tauri_plugin_window_state::StateFlags::MAXIMIZED
+                | tauri_plugin_window_state::StateFlags::DECORATIONS
+                | tauri_plugin_window_state::StateFlags::FULLSCREEN,
+        );
+        builder = builder.plugin(window_state_builder.build());
 
         builder = builder.on_window_event(move |window, event| {
             #[cfg(target_os = "macos")]

src-tauri/tauri.linux.conf.json

@@ -0,0 +1,10 @@
+{
+  "app": {
+    "windows": [
+      {
+        "label": "main",
+        "visible": false
+      }
+    ]
+  }
+}