What I expected to happen...:
The Development Launcher to not display error information

What actuallly happened was...:
While the game was minimized while in game (any menu or GUI) and the launcher was opened, The following error was re displayed constantly until the game was unminimized:
Client> 1234-56-79 12:34:56 [CLIENT] [SEVERE] ########## GL ERROR ##########
Client> 1234-56-79 12:34:56 [CLIENT] [SEVERE] @ Post render
Client> 1234-56-79 12:34:56 [CLIENT] [SEVERE] 1286: Invalid framebuffer operation
(This error does not affect the game in any way)

Steps to reproduce:
1. open launcher
2. Start Mincraft
3. minimize the Minecraft window
4. look in the Development Console