fix: use legacy ColorChooserDialog to sidestep GTK4 ColorDialog popover bug completely

src/ui/editor.rs

@@ -1,7 +1,7 @@
 use crate::composite_icon::CompositeIcon;
 use gtk::prelude::*;
 use gtk::{
-    Box as GtkBox, ColorDialog, Label, Orientation, Picture, ScrolledWindow,
+    Box as GtkBox, Label, Orientation, Picture, ScrolledWindow,
 };
 use std::cell::RefCell;
 use std::rc::Rc;
@@ -227,8 +227,6 @@ pub fn build_editor_page(
                     .child(&drawing_area)
                     .build();
 
-                let dialog = ColorDialog::builder().title("Pick a Color").build();
-
                 {
                     let composite = Rc::clone(&composite);
                     let tag = tag.clone();
@@ -237,7 +235,6 @@ pub fn build_editor_page(
                     let drawing_area = drawing_area.clone();
                     
                     button.connect_clicked(move |btn| {
-                        let dialog = dialog.clone();
                         let tag = tag.clone();
                         let composite = Rc::clone(&composite);
                         let refresh_preview = refresh_preview.clone();
@@ -246,8 +243,13 @@ pub fn build_editor_page(
                         let parent_window = btn.root().and_downcast::<gtk::Window>();
                         let initial_color = current_rgba.borrow().clone();
                         
-                        dialog.choose_rgba(parent_window.as_ref(), Some(&initial_color), gtk::gio::Cancellable::NONE, move |res| {
-                            if let Ok(new_rgba) = res {
+                        let dialog = gtk::ColorChooserDialog::new(Some("Pick a Color"), parent_window.as_ref());
+                        dialog.set_use_alpha(false);
+                        dialog.set_rgba(&initial_color);
+                        
+                        dialog.connect_response(move |d, response| {
+                            if response == gtk::ResponseType::Ok {
+                                let new_rgba = d.rgba();
                                 let new_hex = format!(
                                     "#{:02x}{:02x}{:02x}",
                                     (new_rgba.red() * 255.0).round() as u8,
@@ -273,7 +275,10 @@ pub fn build_editor_page(
                                     refresh_preview();
                                 }
                             }
+                            d.destroy();
                         });
+                        
+                        dialog.show();
                     });
                 }