bug#16497: 24.3.50; `move-to-column' ignores invisible text at the beginning of the line, which create problems when using string-rectangle

[Bastien]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> It's probably due to the post-command processing which tries to move
> point outside of invisible regions and to pretend that invisible regions
> don't exist at all (and paying attention to stickiness so that it
> prefers text positions where `invisible' won't be inherited).
>
> So moving from "before a" to "before b" ends up moving to "before c"
> so that C-f from "before a" moves visually by one char (to "before c").

Thanks -- you nearly lost me here!

Should not this be considered a bug?

I don't have a real-world use case where this would happen,
but it is obviously wrong and suggests other similar errors
could bite the user.

-- 
 Bastien