IO Log text is difficult to select

In at least some cases, it is hard to select text in the IO Log. I can double click to select words and triple click to select lines, but I can't seem to click and drag to select text

Start by reproducing the selection problem in the IO Log UI, checking whether double-click and triple-click work while click-and-drag fails. Trace the IO Log text-rendering entry point and identify the selection behavior; done means users can drag across text to select it without breaking word or line selection.

Written by the indexing model from the issue text.