Ignore errors by code

[Taitava]

Background: On Windows, command git-gui launches a graphical Git client correctly, but for some reason the command returns an error code 259 and a message Command failed: git-gui.

I'd like to think about would it be feasible to be able to ignore certain error codes, so that the user could define on a per command basis which error codes they would like to supress. Supressing an error code would mean that the error message won't get displayed.

Currently the workaround for git-gui is to use start git-gui. Then it works without giving any error message.