BUG #11872: row height is not quite tall eneough

The following bug has been logged on the website:

Bug reference:      11872
Logged by:          pgadmin result grid
Email address:      drickner@indy.rr.com
PostgreSQL version: 9.4beta2
Operating system:   Windows 7 x64
Description:

to display '_' (underscore) characters in fields.  They appear as spaces
unless you change the row height by about a pixel or 2.