Allocate sufficient area to sub-views
Presently sub-views are attached directly below each other. This is perfectly fine visibly as long as sub-views have enough content to show. However, in case of lack of content in one sub-view (Less rows in the process-list-box for example), the next sub-view shows up adding unwanted data to the screen estate.
Used dirty hacks in
performance-view.vala for taking the screenshots below.