* this actually fixes#1219
* the terminal page should check the checkbox on the options page
* Discard these changes from #2651
* Add comments, pull function out to helper
found by cppcheck
[src/propsheet/OptionsPage.cpp:216] -> [src/propsheet/OptionsPage.cpp:242]: (warning) Either the condition 'lParam' is redundant or there is possible null pointer dereference: pshn.
[src/propsheet/TerminalPage.cpp:352] -> [src/propsheet/TerminalPage.cpp:378]: (warning) Either the condition 'lParam' is redundant or there is possible null pointer dereference: pshn.