[Patch] [Feature] Gradient Fill for Cells in Calc

[Stefan Knorr]

Hello all,

so, here's an attempt at a UX view at the feature:
* most of the UI looks the same as comparable UI for drawing objects –
which is excellent, because that makes the UIs consistent, and because
it already uses time-tested UI (which of course doesn't mean that it's
absolutely ideal, either)
* Among the design team we had some ideas regarding gradient
manipulation from the toolbars etc., see:
http://wiki.documentfoundation.org/Design/Whiteboards/Color_picker .
But that's not the most important thing right now.

* What I feel is the most important thing lacking in the current
behaviour implemented is colouring multiple cells with a _consistent_
gradient. If every cell gets its own little gradient that will inspire
lots of horrible designs. Being able to colour the background of the
entire sheet or at least an area of cells could lead to visually more
appealing effects.
Of course, that would seem to make the UI much more complex..?

* An additional pain point: the in-built are still pretty awful. But
that's probably out of scope for you and more in scope for the design
team...

Astron.