[Bf-committers] Enhancement of texture management in Properties (buttons space)

[Bastien Montagne]

Hi devs,

The goal of this patch ( http://www.pasteall.org/42290/diff ) is to 
address the somewhat weak handling of stackless textures in Blender with 
default (BI) renderer. To do so, it's defining an "other" texture 
context, and when in this one, it switches to using the "new shading" 
texture handling already known with Cycles engine.

So now, in the new "other" tex context, you can (depending on active 
data) have direct access to modifiers', force's or brushes' textures...

I also refactored a bit how texture contexts are handled (once again, we 
had some quite similar code in both space_buttons and RNA sources). This 
should also solve some harmless glitches like "no texture context 
selected in UI" sometimes when you remove data related to current 
texture (see e.g. after removing the material from default cube, in 
startup scene).

This usage of two different systems for textures, and the handling of 
switches between them, has been a bit tricky to get working right, but 
it is OK now I think. I also had to add a bool flag to buttons space, 
SB_TEX_USER_LIMITED (use_limited_texture_context in RNA), which 
indicates "new shading" texture code whether it has to ignore materials, 
lamps etc. (BI) or not (Cycles).

Btw, pinned textures from modifiers/force/etc. were also broken (showing 
nothing), now it should work too.

Best regards,
Bastien