[dwm] View-previous-tags patch ported to dwm-4.5.

Hi,

recently yiyus wrote a lovely patch based upon my idea (in turn based
upon GNU screen's behaviour of jumping between two terminals with one
keystroke). See previous postings on the subject for more discussion.

Attached please find the patch ported to dwm-4.5.

I really think it would be very useful to have that functionality in
mainline dwm. It's extremely productive. Arg, what do you think?

Best,

[a]

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. Antoni Grzymala - antoni (at) chopin.edu.pl -------------------.
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