Tighten glyph atlas updates

core/src/render/texture.rs

@@ -17,36 +17,36 @@ pub struct GpuTextures {
 
 impl GpuTextures {
     pub fn update(&mut self, textures: &mut Textures) -> bool {
-        let mut changed = false;
+        let mut bindings_changed = false;
         for update in textures.updates() {
-            match update {
+            bindings_changed |= match update {
                 TextureUpdate::Push(image) => {
                     self.push(image);
-                    changed = true;
+                    true
                 }
                 TextureUpdate::Set(i, image) => {
                     self.set(i, image);
-                    changed = true;
+                    true
                 }
                 TextureUpdate::Patch(i, rect, image) => {
-                    // Patching contents leaves the binding array unchanged.
                     self.patch(i, rect, image);
+                    false
                 }
                 TextureUpdate::SetFree => {
                     self.view_count += 1;
-                    changed = true;
+                    true
                 }
                 TextureUpdate::Free(i) => {
                     self.free(i);
-                    changed = true;
+                    true
                 }
                 TextureUpdate::PushFree => {
                     self.push_free();
-                    changed = true;
+                    true
                 }
-            }
+            };
         }
-        changed
+        bindings_changed
     }
     fn set(&mut self, i: u32, image: &DynamicImage) {
         self.view_count += 1;