Solution for boolean attributes that need row data: Use the default but hold on to the value that couldn't be parsed, defer processing until later.

api/js/etemplate/Et2Widget/Et2Widget.ts

@@ -76,6 +76,13 @@ const Et2WidgetMixin = (superClass) =>
 		protected _dom_id : string = "";
 		private statustext : string = "";
 
+		/**
+		 * TypeScript & LitElement ensure type correctness, so we can't have a string value like "$row_cont[disable_me]"
+		 * as a boolean property so we store them here, and parse them when expanding.  Strings do not have this problem,
+		 * since $row_cont[disable_me] is still a valid string.
+		 */
+		protected _deferred_properties : { [key : string] : string } = {};
+
 
 		/** WebComponent **/
 		static get styles()
@@ -343,6 +350,20 @@ const Et2WidgetMixin = (superClass) =>
 			}
 		}
 
+		/**
+		 * Any attribute that refers to row content cannot be resolved immediately, but some like booleans cannot stay a
+		 * string because it's a boolean attribute.  We store them for later, and parse when they're fully in their row.
+		 */
+		get deferredProperties()
+		{
+			return this._deferred_properties;
+		}
+
+		set deferredProperties(value)
+		{
+			this._deferred_properties = value;
+		}
+
 		/**
 		 * Do some fancy stuff on the label, splitting it up if there's a %s in it
 		 *
@@ -963,6 +984,9 @@ const Et2WidgetMixin = (superClass) =>
 				copy[key] = this[key];
 			}
 
+			// Keep the deferred properties
+			copy._deferred_properties = this._deferred_properties;
+
 			// Create a clone of all child widgets of the given object
 			for(let i = 0; i < this.getChildren().length; i++)
 			{
@@ -1276,6 +1300,14 @@ function transformAttributes(widget, mgr : et2_arrayMgr, attributes)
 				// If the attribute is marked as boolean, parse the
 				// expression as bool expression.
 				attrValue = mgr ? mgr.parseBoolExpression(attrValue) : attrValue;
+				if(typeof attrValue === "string")
+				{
+					// Parse decided we still needed a string ($row most likely) so we'll defer it until later
+					// Repeating rows & nextmatch will parse it again when doing the row
+					widget.deferredProperties[attribute] = attrValue;
+					// Leave the current value at whatever the default is
+					continue;
+				}
 				break;
 			case Function:
 				// We parse it into a function here so we can pass in the widget as context.

api/js/etemplate/et2_extension_nextmatch_rowProvider.ts

@@ -23,7 +23,6 @@ import {et2_arrayMgrs_expand} from "./et2_core_arrayMgr";
 import {et2_dataview_grid} from "./et2_dataview_view_grid";
 import {egw} from "../jsapi/egw_global";
 import {et2_IDetachedDOM, et2_IDOMNode} from "./et2_core_interfaces";
-import {Et2DateTimeReadonly} from "./Et2Date/Et2DateTimeReadonly";
 
 /**
  * The row provider contains prototypes (full clonable dom-trees)
@@ -180,17 +179,7 @@ export class et2_nextmatch_rowProvider
 			// WebComponent IS the node, and we've already cloned it
 			if(typeof window.customElements.get(widget.localName) != "undefined")
 			{
-				/*
-				// N.B. cloneNode widget is missing its unreflected properties and we need to use widget.clone()
-				// instead to get them.  This slows things down.
-				let c = widget.clone();
-				let partial = entry.nodeFuncs[0](row);
-				partial.parentNode.insertBefore(c, partial);
-				partial.parentNode.removeChild(partial);
-				widget = c;
-				 */
-				// Use the clone, not the original
-				widget = entry.nodeFuncs[0](row);
+				widget = this._cloneWebComponent(entry, row, data);
 			}
 			else
 			{
@@ -267,6 +256,30 @@ export class et2_nextmatch_rowProvider
 		return rowWidget;
 	}
 
+	/**
+	 * Get the cloned web component
+	 */
+	_cloneWebComponent(entry, row, data)
+	{
+		/*
+		// N.B. cloneNode widget is missing its unreflected properties and we need to use widget.clone()
+		// instead to get them.  This slows things down and is to be avoided if we can.
+		let c = widget.clone();
+		let partial = entry.nodeFuncs[0](row);
+		partial.parentNode.insertBefore(c, partial);
+		partial.parentNode.removeChild(partial);
+		widget = c;
+		 */
+
+		// Use the clone, not the original
+		let widget = entry.nodeFuncs[0](row);
+
+		// Deal with the deferred properties like booleans with string values - we can't reflect them, and we don't want to lose them
+		// No need to transform here, that happens later
+		Object.assign(data, entry.widget.deferredProperties);
+
+		return widget;
+	}
 
 	/**
 	 * Placeholder for empty row