Make error overlay text more easily selectable.

[gwhitney]

The answer to this is probably no, so don't sweat it, but is there any way to make the text copy-paste-able? That's a feature of the best types of error messages, especially when instructed to email the error to someone. :)

Originally posted by @katestange in #575 (comment)

[gwhitney]

Actually, the text is selectable, as hitting the "select all" key (typically Control-A or Command-A) shows. Glen thinks the difficulty is that the canvas underlying the error overlay is grabbing all of the mouse events, so none of them get to the overlay text elements to cause them to be selected. He suggests some possible avenues to correct this in the quote below, but there may be others:

• turning off the event handling of the sketch, or
• doing some javascript magic to also grab the events that occur in that rectangle, in addition to the sketch getting them, possibly handling clicks and adjusting the selection ourselves.