diff --git a/src/ui/editor.rs b/src/ui/editor.rs
index 233c2b5..a71c3c4 100644
--- a/src/ui/editor.rs
+++ b/src/ui/editor.rs
@@ -129,10 +129,16 @@ pub fn build_editor_page(
         let composite = Rc::clone(&composite);
         let refresh_preview = refresh_preview.clone();
         scale_x.connect_value_changed(move |s| {
-            let mut comp = composite.borrow_mut();
-            if (comp.emblem_x - s.value()).abs() > f64::EPSILON {
-                comp.emblem_x = s.value();
-                comp.is_modified = true;
+            let mut changed = false;
+            {
+                let mut comp = composite.borrow_mut();
+                if (comp.emblem_x - s.value()).abs() > f64::EPSILON {
+                    comp.emblem_x = s.value();
+                    comp.is_modified = true;
+                    changed = true;
+                }
+            }
+            if changed {
                 refresh_preview();
             }
         });
@@ -141,10 +147,16 @@ pub fn build_editor_page(
         let composite = Rc::clone(&composite);
         let refresh_preview = refresh_preview.clone();
         scale_y.connect_value_changed(move |s| {
-            let mut comp = composite.borrow_mut();
-            if (comp.emblem_y - s.value()).abs() > f64::EPSILON {
-                comp.emblem_y = s.value();
-                comp.is_modified = true;
+            let mut changed = false;
+            {
+                let mut comp = composite.borrow_mut();
+                if (comp.emblem_y - s.value()).abs() > f64::EPSILON {
+                    comp.emblem_y = s.value();
+                    comp.is_modified = true;
+                    changed = true;
+                }
+            }
+            if changed {
                 refresh_preview();
             }
         });
@@ -153,10 +165,16 @@ pub fn build_editor_page(
         let composite = Rc::clone(&composite);
         let refresh_preview = refresh_preview.clone();
         scale_size.connect_value_changed(move |s| {
-            let mut comp = composite.borrow_mut();
-            if (comp.emblem_size - s.value()).abs() > f64::EPSILON {
-                comp.emblem_size = s.value();
-                comp.is_modified = true;
+            let mut changed = false;
+            {
+                let mut comp = composite.borrow_mut();
+                if (comp.emblem_size - s.value()).abs() > f64::EPSILON {
+                    comp.emblem_size = s.value();
+                    comp.is_modified = true;
+                    changed = true;
+                }
+            }
+            if changed {
                 refresh_preview();
             }
         });