In a recent post, using the URL button/Link Builder, I accidentally posted the description in the URL text-entry box and the URL in the Description box. When I clicked the "Build link" button, both boxes were cleared, with the Link Builder pop-up staying in the forefront. Just wondering if this is due to some intentional programming. Or if it's a "feature"?

It definitely helps avoid pollution with invalid URL links, due to PEBCAK (Problem Exists Between Chair And Keyboard) errors. Though, an error message would have been helpful. Took me three tries before I figured out what I was doing wrong.