Ensure shader is not set if code did not change

editor/editor_properties.cpp

@@ -2591,7 +2591,8 @@ void EditorPropertyResource::_resource_selected() {
 
 	if (use_sub_inspector) {
 
-		get_edited_object()->editor_set_section_unfold(get_edited_property(), assign->is_pressed());
+		bool unfold = !get_edited_object()->editor_is_section_unfolded(get_edited_property());
+		get_edited_object()->editor_set_section_unfold(get_edited_property(), unfold);
 		update_property();
 	} else {
 
@@ -2775,7 +2776,7 @@ void EditorPropertyResource::_bind_methods() {
 
 EditorPropertyResource::EditorPropertyResource() {
 
-	opened_editor = true;
+	opened_editor = false;
 	sub_inspector = NULL;
 	sub_inspector_vbox = NULL;
 	use_sub_inspector = bool(EDITOR_GET("interface/inspector/open_resources_in_current_inspector"));

editor/plugins/shader_editor_plugin.cpp

@@ -47,6 +47,9 @@ Ref<Shader> ShaderTextEditor::get_edited_shader() const {
 }
 void ShaderTextEditor::set_edited_shader(const Ref<Shader> &p_shader) {
 
+	if (shader == p_shader) {
+		return;
+	}
 	shader = p_shader;
 
 	_load_theme_settings();
@@ -415,6 +418,9 @@ void ShaderEditor::edit(const Ref<Shader> &p_shader) {
 	if (p_shader.is_null() || !p_shader->is_text_shader())
 		return;
 
+	if (shader == p_shader)
+		return;
+
 	shader = p_shader;
 
 	shader_editor->set_edited_shader(p_shader);
@@ -438,8 +444,12 @@ void ShaderEditor::save_external_data() {
 void ShaderEditor::apply_shaders() {
 
 	if (shader.is_valid()) {
-		shader->set_code(shader_editor->get_text_edit()->get_text());
-		shader->set_edited(true);
+		String shader_code = shader->get_code();
+		String editor_code = shader_editor->get_text_edit()->get_text();
+		if (shader_code != editor_code) {
+			shader->set_code(editor_code);
+			shader->set_edited(true);
+		}
 	}
 }