If we set selection before the IconView is laid out, it has no size.
So it can't correctly calculate where to scroll. Forcing scroll after
the first resize fixes that.
Rather than invalidating the entire window, which is very expensive on
the transparent desktop widget, just invalidate the areas that actually
need updating.
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED)
Since all of these checks are done in release builds as well,
let's rename them to VERIFY to prevent confusion, as everyone is
used to assertions being compiled out in release.
We can introduce a new ASSERT macro that is specifically for debug
checks, but I'm doing this wholesale conversion first since we've
accumulated thousands of these already, and it's not immediately
obvious which ones are suitable for ASSERT.
In some circumstances (like template selection dialogs,) displaying as much
item label as possible, on all items, may be desired.
The default setting is 'false', which matches the default behaviour from before;
only wrapping on hover or selection.
