Here's the xwininfo for the very left edge of the screen. I realized I should be more explicit about my setup: I have the "Never hide" option selected for the launcher. So the launcher is always on the screen. And when I hover over the left edge of the screen tooltips don't appear and clicks don't work. From this xwininfo, it seems it's actually the left *two* pixels that don't work.
Here's the xwininfo for the very left edge of the screen. I realized I should be more explicit about my setup: I have the "Never hide" option selected for the launcher. So the launcher is always on the screen. And when I hover over the left edge of the screen tooltips don't appear and clicks don't work. From this xwininfo, it seems it's actually the left *two* pixels that don't work.