big refactor and cleanup of dock + use tokio mpsc

examples/dock/utils.rs

@@ -1,6 +1,7 @@
 use std::path::PathBuf;
 
-use glib;
+use gtk4::glib;
+use std::future::Future;
 
 use crate::DockObject;
 use crate::Item;
@@ -20,3 +21,18 @@ pub fn data_path() -> PathBuf {
     path.push("data.json");
     path
 }
+
+pub fn _thread_context() -> glib::MainContext {
+    glib::MainContext::thread_default().unwrap_or_else(|| {
+        let ctx = glib::MainContext::new();
+        ctx.push_thread_default();
+        ctx
+    })
+}
+
+pub fn _block_on<F>(future: F) -> F::Output
+where
+    F: Future,
+{
+    _thread_context().block_on(future)
+}