BugFix #7115

The "Strands" settings is a BlockBut and never return B_MATPRV like the others buttons, because of this,
never call BIF_preview_changed.

It's posible two fix for this:
	1) make all the buttons into the "Strands" panel return B_MATPRV (this modify the "work mode" of the panel)
	2) Add a call to BIF_preview_changed to the end of strands_menu function (as do_matbuts).

The problem with the first options, is that the panel "close" when you press/release some of the buttons, so
to preserve the current "work mode" of the panel, i choose the second option.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/src/buttons_shading.c b/source/blender/src/buttons_shading.c
index 9309a07642a..1e1a9b1e01f 100644
--- a/source/blender/src/buttons_shading.c
+++ b/source/blender/src/buttons_shading.c
@@ -3596,7 +3596,7 @@ static uiBlock *strand_menu(void *mat_v)
 	uiDefButF(block, NUMSLI, 0, "Shape ",	10, 10, 230,20,  &ma->strand_ease, -0.9, 0.9, 2, 0, "Shape of strands, positive value makes it rounder, negative makes it spiky");
 
 	uiBlockSetDirection(block, UI_TOP);
-	
+	BIF_preview_changed(ID_MA);
 	return block;
 }