[MacPorts] #55626: freetype 2.8x : restore line height as it was in 2.7.1 and earlier

[MacPorts]

#55626: freetype 2.8x : restore line height as it was in 2.7.1 and earlier
----------------------+----------------------
 Reporter:  RJVB      |      Owner:
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:  haspatch  |       Port:  freetype
----------------------+----------------------
 Freetype 2.8 introduced a fix for an old regression I never even noticed
 but with a very noticeable side-effect: it causes an almost 10% reduction
 in the number of lines that will be displayed in editors, terminals, etc.
 (e.g. 70 instead of 76 using Ubuntu Mono 12pt). This difference can be
 observed by overlaying screenshots of applications using FT 2.7.1 and
 2.8/2.8.1 in semi-transparant mode; individual lines overlap perfectly but
 not more than 1 at a time.

 I found a fix online:
 https://bbs.archlinux.org/viewtopic.php?pid=1717280#p1717280 and prepared
 the attached patch that applies to both 2.8 and 2.8.1 . This patch clearly
 affects almost exclusively the vertical (y) metrics and indeed I notice no
 other changes.

 Vertical screen space is at a much more important premium than horizontal
 space so I would suggest providing this "legacy" mode via a build variant.

--
Ticket URL: <https://trac.macports.org/ticket/55626>
MacPorts <https://www.macports.org/>
Ports system for macOS