Temp workaround: Object mode pie glitches since 'Edit Strokes' mode was introduced

To ensure all items of a pie are always at the same position, invisible dummy buttons were added for unavailable items. This caused mainly two issues: Command line printed warning because of the > 8 elements, and some modes weren't visible in some cases ('Object Mode' entry was missing in stroke edit mode).
To solve this nicely, we had to support > 8 items per pie. Will look into that this week, but for now, drawing dummy buttons is disabled.

From a user POV this has two ugly consequences: 1. While this temporary workaround is used, *some* pie items are positioned differently than before, 2. The 'Edit Strokes' mode entry might change its position depending on the amount of available modes.

source/blender/editors/interface/interface_layout.c

@@ -923,7 +923,17 @@ void uiItemsFullEnumO(
 			target = uiLayoutColumn(split, layout->align);
 		}
 
-		if (radial) {
+		if (0 && radial) {
+			/* XXX Disabled as temporary workaround!
+			 *
+			 * Normally, we always draw a button for all items even if they're unavailable (we draw invisible
+			 * dummy buttons then), so items are always at the same position. This causes issues with current
+			 * 'Object Mode' pie since more than 8 modes exist now (see T46973).
+			 * Disabling this until more than 8 items per pie are supported (or a better solution is found).
+			 * We should work on that ASAP though.
+			 *
+			 * - Julian (Dec 2015)
+			 */
 			RNA_property_enum_items_gettexted_all(block->evil_C, &ptr, prop, &item_array, NULL, &free);
 		}
 		else {
@@ -973,6 +983,7 @@ void uiItemsFullEnumO(
 				}
 				else {
 					if (radial) {
+						/* invisible dummy button to ensure all items are always at the same position */
 						uiItemS(target);
 					}
 					else {