Drop fontconfig tweaks introduced in version 20170828 (See: #873462).

 - Full hinting support was removed upstream, in pango 1.44.
 - Forcing truetype:interpreter-version=35 through FREETYPE_PROPERTIES
   now leads to arguably worse rendering than with default settings.

With or without the aforementioned changes, the rendering looks much
worse than it used to (until Debian Installer Bullseye Alpha 3), due
to a behavioral change in pango. Since it affects default fonts, and
not only in the installer's context, one might have hoped for a fix
at some point but that doesn't seem to be happening. We might try to
use different fonts to try and dodge this issue… Until then, here
are some pointers to bugtracker entries:
 - https://bugs.debian.org/956612
 - https://gitlab.gnome.org/GNOME/pango/-/issues/404
 - https://github.com/harfbuzz/harfbuzz/issues/1892

build/Makefile

@@ -596,16 +596,6 @@ endif
 		zcat $(TREE)/usr/share/localechooser/languagelist.data.gz >> $(TEMP)/all.utf; \
 	fi
 
-	# Keep the original rendering for the graphical installer, reverting
-	# changes in defaults for fontconfig and freetype, until they have
-	# been further discussed/analysed, see #873462:
-	if [ -L "$(TREE)/etc/fonts/conf.d/10-hinting-slight.conf" ]; then \
-		ln -sf /usr/share/fontconfig/conf.avail/10-hinting-full.conf \
-			"$(TREE)/etc/fonts/conf.d/10-hinting-slight.conf"; \
-		echo 'export FREETYPE_PROPERTIES="truetype:interpreter-version=35"' \
-			> "$(TREE)/lib/debian-installer.d/S63freetype-workaround"; \
-	fi
-
 	# Run fc-cache if needed, to avoid having to generate UUIDs
 	# at runtime, which can be hard because of missing entropy
 	# (#898468). Beware, fc-cache insists on having a directory

debian/changelog

@@ -2,6 +2,20 @@ debian-installer (20200315) UNRELEASED; urgency=medium
 
   [ Cyril Brulebois ]
   * Bump Linux kernel ABI to 5.9.0-2
+  * Drop fontconfig tweaks introduced in version 20170828 (See: #873462):
+     - Full hinting support was removed upstream, in pango 1.44.
+     - Forcing truetype:interpreter-version=35 through FREETYPE_PROPERTIES
+       now leads to arguably worse rendering than with default settings.
+  * With or without the aforementioned changes, the rendering looks much
+    worse than it used to (until Debian Installer Bullseye Alpha 3), due
+    to a behavioral change in pango. Since it affects default fonts, and
+    not only in the installer's context, one might have hoped for a fix
+    at some point but that doesn't seem to be happening. We might try to
+    use different fonts to try and dodge this issue… Until then, here
+    are some pointers to bugtracker entries:
+     - https://bugs.debian.org/956612
+     - https://gitlab.gnome.org/GNOME/pango/-/issues/404
+     - https://github.com/harfbuzz/harfbuzz/issues/1892
 
   [ Vagrant Cascadian ]
   * Update Firefly-RK3288 image for new u-boot version.