multiplie urxvt windows, regression, v 5.2 -> git

[Janez Rom]

Hello

Problem should be ilustrated in this way:

     - screen shot no1 : two windows with big horizontal gap (to big).

     - screen shot no2: two windows with frame added on the right side. 
Horizontal gap betweeen two horizontal windows became smaller (should be 
ok).

Janez
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