Add locking the sorting on meessages list

[piotrus0383]

The sorting locking option would be very useful. I use sorting by date. When I want to click the first message on the list I often click bar above it (with "Subject" label) which changes the sorting to "by Subject". Then I must change it again to "by Date" which is very inconvinient. Locking option would be great.

[Jon]

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