Steps to reproduce the issue

Go to Content / Article / New
Enter just a single space in the Title field and click Save
The form is submitted but not saved because of the server side check

Expected result

Field could be validated before submission

Actual result

Field is not validated

System information (as much as possible)

Additional comments

The Javascript code to validate the field would be very simple:

	function (value) {
		if (value.length === 0) {
			return true;
		}
		return value.trim().length > 0;
	});

Questions:

Is it worth doing this at all?
Should it be done on demand by including a class attribute in the form xml file?
Should it be done by default for all text and textarea fields?
Should I tackle this myself or leave it for a more experienced Javascript developer?