I get the following 10X times a day by accident.
Entering Ex mode. Type "visual" to go to Normal mode.
How can you disable the combo which causes it in Vim?
On
Another, albeit slightly more extreme option, would be to switch to https://neovim.io, which has removed ex-mode entirely, due to no one ever actually using it for anything ever.
This answer is based on @NielsBom's comment 4. October 2012 and on @BrianCarper's answer 13. August 2009.
I think NielsBom is completely right, please see the article. The command
mapis really evil in Vim and has caused me a lot of problems during years. I did not realize the thing before NielsBom's comment. So please use the following command instead: