Allow panes to maximize to their parent containers size. #1041
Description
Allow panes to maximize to their parent containers size not the full window size.
I.E if you have split terminator vertically and then split one of those halves horizontally you may then maximize one of those siblings to the size of the full half.
In the example images below I use the left half for compiling and the large scroll back height. The bottom right term I use for running what I'm building and often want to maximize it to read logger output. However I don't need the full window size.
I built a Qt pane system which allowed the same thing. Global maximize and pane level maximize. Yes it has the possibility to become a turtles all the way down and get confusing as to what is maximized and not. In my Qt system I painted borders so that it was easy to visually denote state. For this idc if such a to infinity and beyond depth wasn't supported and only allowed 1 level globally.
Before
After
