Get legacy JS parser to understand functions that don't start with "app." and don't have brackets in the attribute.

This covers widget or other non-app static functions (eg: et2_avatar.uploadAvatar_onFinish)

api/js/etemplate/et2_core_legacyJSFunctions.js

@@ -123,6 +123,28 @@
 			context = _widget.getDOMNode();
 		}
 
+		// Check to see if it's referring to an existing function with no arguments specified.
+		// If so, bind context & use it directly
+		var parts = _code.split(".");
+		var existing_func = parts.pop();
+		var parent = _widget.egw().window;
+		for(var i=0; i < parts.length; ++i)
+		{
+			if (typeof parent[parts[i]] !== "undefined")
+			{
+				parent = parent[parts[i]];
+			}
+			// Nope
+			else
+			{
+				break;
+			}
+		}
+		if (typeof parent[existing_func] === "function")
+		{
+			return parent[existing_func].bind(context);
+		}
+
 		// Generate the function itself, if it fails, log the error message and
 		// return a function which always returns false
 		try {

api/js/etemplate/et2_widget_file.js

@@ -481,9 +481,6 @@ var et2_file = /** @class */ (function (_super) {
         if (typeof this.onFinishOne == 'function') {
             this.onFinishOne(event, response, name);
         }
-        else if (this.options.onFinishOne) {
-            et2_call(this.options.onFinishOne, event, response, name);
-        }
         return true;
     };
     /**

api/js/etemplate/et2_widget_file.ts

@@ -665,14 +665,10 @@ export class et2_file extends et2_inputWidget
 		event.data = this;
 
 		// Callback
-		if(typeof this.onFinishOne == 'function' && !this.options.onFinishOne)
+		if(typeof this.onFinishOne == 'function')
 		{
 			this.onFinishOne(event, response, name);
 		}
-		else if (this.options.onFinishOne)
-		{
-			et2_call(this.options.onFinishOne,event,response,name);
-		}
 		return true;
 	}