fix: two possible causes of flickering

still flickers, likely due to aborting not working
since the async code isn't really async...

src/app/maybe_image.rs

@@ -5,7 +5,13 @@ use image::DynamicImage;
 pub enum MaybeImage {
     #[default]
     Unloaded,
+
+    #[allow(dead_code)]
+    /// should be abort_on_drop,
+    /// so that it will abort, for instance,
+    /// when it's set back to `Self::Unloaded`
     Loading(task::Handle),
+
     Loaded(widget::image::Handle),
 }
 impl MaybeImage {
@@ -15,14 +21,6 @@ impl MaybeImage {
             _ => None,
         }
     }
-
-    pub fn unload(&mut self) {
-        match self {
-            Self::Loading(task_handle) => task_handle.abort(),
-            _ => {}
-        }
-        *self = Self::Unloaded;
-    }
 }
 
 pub fn handle_from_image(image: DynamicImage) -> widget::image::Handle {

src/app/mod.rs

@@ -66,8 +66,9 @@ impl State {
     fn update(&mut self, message: Message) -> Task<Message> {
         match message {
             Message::LoadImage(path) => {
-                let path_clone = path.clone();
+                let entry = self.images.entry(path.clone()).or_default();
 
+                if matches!(entry, MaybeImage::Unloaded) {
                     let (task, handle) = Task::perform(
                         async {
                             utils::load_image(&path)
@@ -78,12 +79,10 @@ impl State {
                     )
                     .abortable();
 
-                self.images.entry(path_clone).and_modify(|e| {
+                    *entry = MaybeImage::Loading(handle.abort_on_drop());
-                    *e = MaybeImage::Loading(handle);
-                });
-
                     return task;
                 }
+            }
             Message::ImageLoaded(result) => {
                 self.error = result.as_ref().err().map(|e| e.to_string());
 
@@ -95,7 +94,7 @@ impl State {
             }
 
             Message::UnloadImage(path) => {
-                self.images.entry(path).and_modify(MaybeImage::unload);
+                self.images.entry(path).insert_entry(MaybeImage::Unloaded);
             }
 
             Message::OpenImage(path) => {