Bugfix #8526

Sometimes a panel could not be moved, this caused by fact that its
parent was sometimes not visible. Old bug actually. :)

There's a lot of editbutton panels btw... so there it happened.

source/blender/src/buttons_editing.c

@@ -6195,6 +6195,9 @@ static void editing_panel_mesh_texface(void)
 		uiDefButC(block, ROW, REDRAWVIEW3D, "Add",		660,80,60,19, &tf->transp, 2.0, (float)TF_ADD,	0, 0, "Render face transparent and add color of face");
 		uiDefButC(block, ROW, REDRAWVIEW3D, "Alpha",	720,80,60,19, &tf->transp, 2.0, (float)TF_ALPHA,0, 0, "Render polygon transparent, depending on alpha channel of the texture");
 	}
+	else
+		uiDefBut(block,LABEL,B_NOP, "(No Active Face)", 10,200,150,19,0,0,0,0,0,"");
+
 }
 
 void do_uvcalculationbuts(unsigned short event)

source/blender/src/interface_panel.c

@@ -606,7 +606,9 @@ static int panel_has_tabs(Panel *panel)
 	if(panel==NULL) return 0;
 	
 	while(pa) {
-		if(pa->paneltab==panel) return 1;
+		if(pa->active && pa->paneltab==panel) {
+			return 1;
+		}
 		pa= pa->next;
 	}
 	return 0;