ContentSize replacement fix

crates/bevy_ui/src/layout/mod.rs

@@ -274,6 +274,11 @@ pub fn ui_layout_system(
         }
     }
 
+    // When a `ContentSize` component is removed from an entity, we need to remove the measure from the corresponding taffy node.
+    for entity in removed_content_sizes.iter() {
+        ui_surface.try_remove_measure(entity);
+    }
+
     for (entity, mut content_size) in measure_query.iter_mut() {
         if let Some(measure_func) = content_size.measure_func.take() {
             ui_surface.update_measure(entity, measure_func);
@@ -283,11 +288,6 @@ pub fn ui_layout_system(
     // clean up removed nodes
     ui_surface.remove_entities(removed_nodes.iter());
 
-    // When a `ContentSize` component is removed from an entity, we need to remove the measure from the corresponding taffy node.
-    for entity in removed_content_sizes.iter() {
-        ui_surface.try_remove_measure(entity);
-    }
-
     // update window children (for now assuming all Nodes live in the primary window)
     ui_surface.set_window_children(primary_window_entity, root_node_query.iter());
 

crates/bevy_ui/src/widget/image.rs

@@ -3,6 +3,7 @@ use crate::{
 };
 use bevy_asset::{Assets, Handle};
 
+use bevy_ecs::change_detection::DetectChanges;
 use bevy_ecs::query::Without;
 use bevy_ecs::{
     prelude::Component,
@@ -96,7 +97,7 @@ pub fn update_image_content_size_system(
                 texture.texture_descriptor.size.height as f32,
             );
             // Update only if size or scale factor has changed to avoid needless layout calculations
-            if size != image_size.size || combined_scale_factor != *previous_combined_scale_factor {
+            if size != image_size.size || combined_scale_factor != *previous_combined_scale_factor  || content_size.is_added() {
                 image_size.size = size;
                 content_size.set(ImageMeasure {
                     // multiply the image size by the scale factor to get the physical size
@@ -135,7 +136,7 @@ pub fn update_atlas_content_size_system(
         if let Some(atlas) = atlases.get(atlas) {
             let size = atlas.textures[atlas_image.index].size();
             // Update only if size or scale factor has changed to avoid needless layout calculations
-            if size != image_size.size || combined_scale_factor != *previous_combined_scale_factor {
+            if size != image_size.size || combined_scale_factor != *previous_combined_scale_factor || content_size.is_added()  {
                 image_size.size = size;
                 content_size.set(ImageMeasure {
                     // multiply the image size by the scale factor to get the physical size

crates/bevy_ui/src/widget/text.rs

@@ -128,7 +128,7 @@ pub fn measure_text_system(
     if *last_scale_factor == scale_factor {
         // scale factor unchanged, only create new measure funcs for modified text
         for (text, content_size, text_flags) in text_query.iter_mut() {
-            if text.is_changed() || text_flags.needs_new_measure_func {
+            if text.is_changed() || text_flags.needs_new_measure_func || content_size.is_added() {
                 create_text_measure(&fonts, scale_factor, text, content_size, text_flags);
             }
         }