[Dextrose] [DESIGN] multi-selection in journal

[Martin Abente]

Hello Amigos,

Lately I have been working on the support for multi-selection in the
journal. This feature was originally part of Dextrose3's TODO [1], but
during EduJAM [2], many people were interested in having it on Sugar
mainstream, so I will give it a try ;)

I already have a functional prototype running on sugar 0.9.x (check
video!) [3], its design was based on different ideas and proposals
[4,5]. My current patch does the minimum required to get this working,
avoiding any big code re-factoring or massive rewrites (for now).

Anyway, I would like to hear everyone's feedback on the current design!

Thanks in advance,
tch

References:
1. http://wiki.sugarlabs.org/go/Dextrose/3/Todo
2. http://wiki.sugarlabs.org/go/EduJAM/2011/Brainstorm
3. http://www.sugarlabs.org/~tch/journal2.mpeg
4. http://wiki.sugarlabs.org/go/Design_Team/Designs/Journal#06
5. http://wiki.sugarlabs.org/go/Journal_NewUI