Not all application thumbnails shown in overview when having many applications running
While it is a very rare case, when user has many programs open at once, dock in overview cannot contain them all. That results in some program icons unreachable in dock, as they just does not fit in dock. Another problem - program icons in dock become very small and hard to select.
After some item limit in dock is reached (probably limited by minimal icon height), icon list in dock should become scrolable, but "Show Applications" icon should be always visible on bottom.
Edited by Andre Klapper