make main window can be reopen if killed by --server for creating ipc

src/common.rs

@@ -197,6 +197,7 @@ lazy_static::lazy_static! {
     static ref IS_SERVER: bool = std::env::args().nth(1) == Some("--server".to_owned());
     // Is server logic running. The server code can invoked to run by the main process if --server is not running.
     static ref SERVER_RUNNING: Arc<RwLock<bool>> = Default::default();
+    static ref IS_MAIN: bool = std::env::args().nth(1).map_or(true, |arg| !arg.starts_with("--"));
 }
 
 #[cfg(not(any(target_os = "android", target_os = "ios")))]
@@ -250,6 +251,11 @@ pub fn is_server() -> bool {
     *IS_SERVER
 }
 
+#[inline]
+pub fn is_main() -> bool {
+    *IS_MAIN
+}
+
 // Is server logic running.
 #[inline]
 pub fn is_server_running() -> bool {