Append error container to inspector

Also modify method that formats the error so only
the text is appended.

Depends on Ie84130d4ac0 in VE-MW.

Bug: T113172
Change-Id: I5310f22877f56d1828a9d1782ee335d5793700df

modules/ve-math/ve.ui.MWMathInspector.js

@@ -85,7 +85,12 @@ ve.ui.MWMathInspector.prototype.initialize = function () {
 
 	// Initialization
 	this.$content.addClass( 've-ui-mwMathInspector-content' );
-	this.form.$element.append( inputField.$element, displayField.$element, idField.$element );
+	this.form.$element.append(
+		inputField.$element,
+		this.$generatedContentsErrorContainer,
+		displayField.$element,
+		idField.$element
+	);
 };
 
 /**
@@ -126,6 +131,13 @@ ve.ui.MWMathInspector.prototype.updateMwData = function ( mwData ) {
 	mwData.attrs.id = id || undefined;
 };
 
+/**
+ * @inheritdoc
+ */
+ve.ui.MWMathInspector.prototype.formatGeneratedContentsError = function ( $element ) {
+	return $element.text().trim();
+};
+
 /* Registration */
 
 ve.ui.windowFactory.register( ve.ui.MWMathInspector );