Hi sage-devel,

Long time ago temporary file names in Sage were created with increasing 
lexicographic order in the same temporary folder:

tmp_00.png, tmp_01.png tmp_02.png ... and so on

This was practical for users looking at pictures in a viewer where the left 
arrow and right arrow was changing picture to the previous or next file 
(lexicographically) in the same folder.

Now (since at least one year, but I don't know which version exactly), tmp 
files are created with some hashed value in the end and the left and right 
arrow do not correspond to the order of creation of the files anymore. Two 
friends of mine keep asking me this question and I now ask this on 
sage-devel. Was this change intended? Is it OK if we change it back to an 
lexicographic order for files?

Sébastien

sage: plot(x, 0, 10)
 -> creates file DOT_SAGE/temp/machine_name/24996/tmp_ZuuV0L.png

sage: plot(x, 0, 11)
 -> creates file DOT_SAGE/temp/machine_name/24996/tmp_ij0dqf.png

sage: plot(x, 0, 12)
 -> creates file DOT_SAGE/temp/machine_name/24996/tmp_yNciio.png

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