Sorting of recent documents

[tomas-52]

In advanced mate menu, Recent documents should be sorted by the time they were last opened (modified in recently-used.xbel).
Instead they are sorted by added in recently-used.xbel.
Let us say that you set the number of recent documents for advanced mate menu to 5,
then open documents named "1" to "6" in the following order: 1, 2, 3, 4, 5, 1, 6.
In recent documents you will see 6, 5, 4, 3 and 2 instead of 6, 1, 5, 4 and 3.
For mintmenu the problem was solved in version 1.6.4 for Mint 20.2 as you can see in the following links:
linuxmint/mint20.2-beta#10
linuxmint/mint20.2-beta#64
linuxmint/mint20.2-beta#75