Created attachment 182350 [details] Showing the four corners of my monitor. 1- Press PrtSc. 2- Drag the corners of the grid to the corners of the screen. Result: The grid incorrectly shows that about 20 pixels will be cropped out.
Those areas are not being cropped out; the handles are simply moved into the visible screen area to prevent you from being unable to move them later. The fact that they're circles makes it look like a visual glitch or that there are areas that won't be included, but that's not the case.
*** Bug 509106 has been marked as a duplicate of this bug. ***
*** Bug 511051 has been marked as a duplicate of this bug. ***
So I guess there are two symptoms: 1. The dots incorrectly represent the recording area 2. The dots are visible in the output recording (#511051)