When a plot is maximzed (via the shortcut Z), and the kst file is stored, it is impossible to de-maximize the plot upon reopening the kst file

Reproducible: Always

Steps to Reproduce:
1.launch kst
2.create two empty plot
3.maximize (Z) one of them
4.store the kst file
5.close kst
6.relaunch kst and open the previously stored kst file
7. try to demaximize the plot


Expected Results:  
The maximized plot should demaximize

Revision 1307223

it seems that the status "maximized" is not stored in the kst file. On reopening the file, the plot is not tagged as maximized (right click on it: no tick on "maximze")