when a file has changed outside of builder, it will not save over the existing contents
@chergert
Submitted by Christian Hergert Link to original bug (#749347)
Description
When trying to save over a file that was externally modified, we get no feedback that the file was not saved.
nothing happens, and there is no feedback to the user.
this should at least do the old behavior with the infobar shown to alert the user and allow them to override.