bug#22699: 25.0.91; Accented characters truncated with DejaVu Sans Mono

[Andy Moreton]

With DejaVu Sans Mono (version 2.35), accented characters are not
displayed properly at some sizes, and appear truncated at the top (as if
a pixel row is missing).

For example, LATIN SMALL LETTER A WITH RING ABOVE "å"

Displays properly
-----------------
In Windows font dialog, choose "Deja Vu Sans Mono", "Bold", "9"

`describe-char' shows the font as:
uniscribe:-outline-DejaVu Sans 
Mono-bold-normal-normal-mono-12-*-*-*-c-*-iso8859-1 (#xA7)

Top of ring is clipped
----------------------
In Windows font dialog, choose "Deja Vu Sans Mono", "Book", "9"

`describe-char' shows the font as:
uniscribe:-outline-DejaVu Sans Mono-normal-normal-normal-mono-12-*-*-*-c-*-=
iso8859-1 (#xA7)

This only appears with DejaVu Sans Mono version 2.35 at this size, with the
"Book" or "Oblique" font styles (larger or smaller sizes display
properly).

In GNU Emacs 25.0.91.2 (x86_64-w64-mingw32)
 of 2016-02-16 built on AJM-DESKTOP
Repository revision: b1a3ebedba88689d26f44cf7db338104b849ae99
Windowing system distributor 'Microsoft Corp.', version 6.1.7601
Configured using:
 'configure --prefix=c:/emacs/emacs-25 --build=x86_64-w64-mingw32
 --without-dbus --enable-checking --enable-check-lisp-object-type
 --with-gif --with-jpeg --with-png --with-tiff --with-xpm --with-gnutls
 --with-rsvg --with-xml2 --without-imagemagick --with-modules 'CFLAGS=
 -g3 -O0' build_alias=x86_64-w64-mingw32
 PKG_CONFIG_PATH=/mingw64/lib/pkgconfig:/mingw64/share/pkgconfig'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS MODULES

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: cp1252

DejaVuSansMono.png
Description: PNG image