When holding down shift, highlight message under cursor

Currently, holding down Shift over a text channel will expand the context buttons of whatever message you're pointing at such that you have single click access to such features as copy message link, delete message or pin message. This feature has the potential to be extremely useful for mass moderation and channel management, except...

...in a modern high resolution monitor, and in particular since message dividers were removed, and especially in Compact Mode, the top right corner of a message is like a hundred meters away from the (always) short message header and (almost always) short message contents. It's very difficult to tell at a glance if you are pointing at the correct message you want to delete/pin/whatever.

I propose that while the user holds down the Shift key, in addition to showing all of the context menu buttons in the top right corner, the background of the message they correspond to is highlighted (in accordance with the currently selected theme, of course):

Then I could actually see what I'm doing!