do not indent impl generics

[scampi]

The fix consists in removing the call to generics_shape_from_config which was indenting generics unnecessarily regardless of the hard_tabs option. The Visual indent style was also adding 2 leading whitespaces which seemed odd; below is a diff of the two formatting versions.

 impl<Target: FromEvent<A> + FromEvent<B>,
-      A: Widget2<Ctx = C>,
-      B: Widget2<Ctx = C>,
-      C: for<'a> CtxFamily<'a>> Widget2 for WidgetEventLifter<Target, A, B>
+     A: Widget2<Ctx = C>,
+     B: Widget2<Ctx = C>,
+     C: for<'a> CtxFamily<'a>> Widget2 for WidgetEventLifter<Target, A, B>
 {
     type Ctx = C;
     type Event = Vec<Target>;
 }

Are the 2 leading whitespaces added on purpose ? Is it OK to remove them ?

Close #3840

[topecongiro]

Are the 2 leading whitespaces added on purpose ? Is it OK to remove them ?

This seems a bug to me. Thank you for the fix!