Posted 8 September 2017, 3:22 pm ESTAlt+Space is actually used as a shortcut to open window form titlebar menu dropdown.
But in fpspread's CheckBoxCellType in fpspread accepts Alt+Space as well and it toggles the checkstate of the checkbox in the cell.
Whereas any cell type other than CheckBoxCellType do now accept it and works as expected.
We want the CheckBoxCellType also to work as other cell type. Only space should be accepted to change the checkstate, not Alt+Space.