Revert "Merge pull request #10192 from samjoch/bug-805133-CalendarMonthV...

...iewJumpsBetween5And6Rows"

This reverts commit a7f7ba9b2700dfff4af102b325a1c9d71ffd6b28, reversing
changes made to f3e2cfe6fbb7fe9206eae398b7fa3448cb850994.