Fix pixelized previews, but also instances of breaking ImageTexture cache. Closes #25378.

editor/editor_node.cpp

@@ -952,6 +952,9 @@ void EditorNode::_save_scene_with_preview(String p_file, int p_idx) {
 	}
 
 	if (img.is_valid()) {
+
+		img = img->duplicate();
+
 		save.step(TTR("Creating Thumbnail"), 2);
 		save.step(TTR("Creating Thumbnail"), 3);
 

editor/editor_resource_preview.cpp

@@ -159,6 +159,7 @@ void EditorResourcePreview::_generate_preview(Ref<ImageTexture> &r_texture, Ref<
 			small_thumbnail_size *= EDSCALE;
 
 			Ref<Image> small_image = r_texture->get_data();
+			small_image = small_image->duplicate();
 			small_image->resize(small_thumbnail_size, small_thumbnail_size, Image::INTERPOLATE_CUBIC);
 			r_small_texture.instance();
 			r_small_texture->create_from_image(small_image);

editor/plugins/asset_library_editor_plugin.cpp

@@ -174,6 +174,7 @@ void EditorAssetLibraryItemDescription::set_image(int p_type, int p_index, const
 					if (preview_images[i].is_video) {
 						Ref<Image> overlay = get_icon("PlayOverlay", "EditorIcons")->get_data();
 						Ref<Image> thumbnail = p_image->get_data();
+						thumbnail = thumbnail->duplicate();
 						Point2 overlay_pos = Point2((thumbnail->get_width() - overlay->get_width()) / 2, (thumbnail->get_height() - overlay->get_height()) / 2);
 
 						thumbnail->lock();

editor/plugins/editor_preview_plugins.cpp

@@ -99,12 +99,14 @@ Ref<Texture> EditorTexturePreviewPlugin::generate(const RES &p_from, const Size2
 	} else {
 		Ref<Texture> tex = p_from;
 		img = tex->get_data();
+		if (img.is_valid()) {
+			img = img->duplicate();
+		}
 	}
 
 	if (img.is_null() || img->empty())
 		return Ref<Texture>();
 
-	img = img->duplicate();
 	img->clear_mipmaps();
 
 	if (img->is_compressed()) {

platform/javascript/os_javascript.cpp

@@ -442,6 +442,9 @@ void OS_JavaScript::set_custom_mouse_cursor(const RES &p_cursor, CursorShape p_s
 
 		if (texture.is_valid()) {
 			image = texture->get_data();
+			if (image.is_valid()) {
+				image->duplicate();
+			}
 		}
 
 		if (!image.is_valid() && atlas_texture.is_valid()) {
@@ -468,6 +471,8 @@ void OS_JavaScript::set_custom_mouse_cursor(const RES &p_cursor, CursorShape p_s
 
 		ERR_FAIL_COND(!image.is_valid());
 
+		image = image->duplicate();
+
 		if (atlas_texture.is_valid())
 			image->crop_from_point(
 					atlas_rect.position.x,