Until now we had a strict sense of which side has the focus. Clicking on the other side switched focus, and only subsequent clicks actually made it to that side.
I think it's a little faster to transmit the first click to that side – as long as you provide visual feedback on what it's going to do, particularly on the Log-browser side.
One bugfix that came up in this context: clicks on the log browser side can scroll the source side, in which case we should clear line_cache.starty. Otherwise future clicks on the source side can go to the wrong line.
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