Re: Shift selection using interactive spec

[Stefan Monnier <monnier@iro.umontreal.ca>]

> Suppose we have an external package that defines the motion commands
> forward-section and backward-section, which move point forward and
> backward by mode-specific amount.  (It might, for example, be rebound
> to M-right or M-left.)

> In shift selection mode, the first unshifted motion command must
> deactivate the mark.  This is the expected behavior.

> Now suppose we make the motion commands responsible for deactivating
> the mark; for example, by adding an interactive spec code that calls a
> function `handle-shift-selection' that checks if the calling key
> sequence was shifted, and deactivates the mark if it was not.  If we
> start to define a shift-selected region using a shifted forward-char
> command, and follow this with an unshifted forward-section command,
> the region won't get deactivated.  Instead, it will extend the region.

Oh, that.  It's a pretty minor bug in my opinion.
And those commands have another bug anyway: using shift with them
doesn't select the region.

> To fix this bug, we would have to change the external package.

Yup.  We have to fix it anyway in order for the shift to start the selection.


        Stefan