This is an opaque floating window that I use to cover the Xcode9 jump bar, which flashes like a madman whenever I edit anything. rdar://32834285.
This is a simple cocoa program that makes a black window that floats above most everything, so you can resize it and position it wherever you want:
It uses Cocoa's built-in window placement features, which aren't terribly reliable, but seems to be working so far for me.
Double-click to make the window transparent enough to see through it.
This code is public domain. Only took me about a half hour to write :-)
You can ignore the blinking of the code - just notice the jump bar. For me, this happens every time I pause for more than a second or two. HEY! LOOK AT ME I'M UP HERE! FORGET THAT CODE YOU'RE TRYING TO CONCENTRATE ON AND LOOK AT ME!!!!
Love,
++md