Only in /tmp/1/etc/fonts/conf.d: 30-urw-aliases.conf
Only in /tmp/2/etc/fonts/conf.d: 45-generic.conf
Only in /tmp/2/etc/fonts/conf.d: 60-generic.conf
diff -ru /tmp/1/etc/fonts/fonts.conf /tmp/2/etc/fonts/fonts.conf
--- /tmp/1/etc/fonts/fonts.conf	2016-08-24 15:21:57.000000000 +0300
+++ /tmp/2/etc/fonts/fonts.conf	2018-05-14 11:32:10.000000000 +0300
Binary files /tmp/1/usr/share/doc/fontconfig-config/changelog.Debian.gz and /tmp/2/usr/share/doc/fontconfig-config/changelog.Debian.gz differ
Binary files /tmp/1/usr/share/doc/fontconfig-config/changelog.gz and /tmp/2/usr/share/doc/fontconfig-config/changelog.gz differ
Only in /tmp/2/usr/share/doc/fontconfig-config: NEWS.Debian.gz
Only in /tmp/1/usr/share/doc/fontconfig-config: README.gz

Only in /tmp/2/usr/share/fontconfig/conf.avail: 10-hinting-full.conf
Only in /tmp/2/usr/share/fontconfig/conf.avail: 10-hinting-medium.conf
Only in /tmp/2/usr/share/fontconfig/conf.avail: 10-hinting-none.conf
Only in /tmp/2/usr/share/fontconfig/conf.avail: 10-hinting-slight.conf

diff -ru /tmp/1/usr/share/fontconfig/conf.avail/10-scale-bitmap-fonts.conf /tmp/2/usr/share/fontconfig/conf.avail/10-scale-bitmap-fonts.conf
--- /tmp/1/usr/share/fontconfig/conf.avail/10-scale-bitmap-fonts.conf	2016-08-24 15:21:57.000000000 +0300
+++ /tmp/2/usr/share/fontconfig/conf.avail/10-scale-bitmap-fonts.conf	2018-05-14 11:32:10.000000000 +0300
@@ -1,9 +1,18 @@
 <?xml version="1.0"?>
 <!DOCTYPE fontconfig SYSTEM "fonts.dtd">
 <fontconfig>
+  <its:rules xmlns:its="http://www.w3.org/2005/11/its" version="1.0">
+    <its:translateRule translate="no" selector="/fontconfig/*[not(self::description)]"/>
+  </its:rules>
 
+  <description>Bitmap scaling</description>
+<!--
+  If font is bitmap, calculate scale factor.
+  Note that color bitmap fonts have scalable=true, while
+  non-color ones have scalable=false.  Both groups have outline=false.
+  -->
 <match target="font">
-  <test name="scalable" compare="eq">
+  <test name="outline" compare="eq">
     <bool>false</bool>
   </test>
   <edit name="pixelsizefixupfactor" mode="assign">
@@ -13,10 +22,20 @@
     </divide>
   </edit>
 </match>
+<!--
+  For non-scalable bitmap fonts (ie. non-color), skip
+  minor scaling if hinting is enabled.
+  -->
 <match target="font">
+  <test name="outline" compare="eq">
+    <bool>false</bool>
+  </test>
   <test name="scalable" compare="eq">
     <bool>false</bool>
   </test>
+  <test name="hinting" compare="eq">
+    <bool>true</bool>
+  </test>
   <edit name="scalingnotneeded" mode="assign">
     <and>
       <less>
@@ -30,20 +49,7 @@
     </and>
   </edit>
 </match>
-<!--
-  So far we determined the scale factor.  Now, check and if
-  scaling is NOT desirable, just reset the scale factor to 1.0.
-  -->
 <match target="font">
-  <test name="scalable" compare="eq">
-    <bool>false</bool>
-  </test>
-  <test name="pixelsize" target="pattern" compare="less">
-    <double>64</double>
-  </test>
-  <test name="hinting" compare="eq">
-    <bool>true</bool>
-  </test>
   <test name="scalingnotneeded" compare="eq">
     <bool>true</bool>
   </test>
@@ -55,7 +61,7 @@
   If we *are* going to scale, go ahead and do it.
   -->
 <match target="font">
-  <test name="scalable" compare="eq">
+  <test name="outline" compare="eq">
     <bool>false</bool>
   </test>
   <test name="pixelsizefixupfactor" compare="not_eq">
diff -ru /tmp/1/usr/share/fontconfig/conf.avail/30-metric-aliases.conf /tmp/2/usr/share/fontconfig/conf.avail/30-metric-aliases.conf
--- /tmp/1/usr/share/fontconfig/conf.avail/30-metric-aliases.conf	2016-08-24 15:21:57.000000000 +0300
+++ /tmp/2/usr/share/fontconfig/conf.avail/30-metric-aliases.conf	2018-05-14 11:32:10.000000000 +0300

... font names changed ...


Only in /tmp/1/usr/share/fontconfig/conf.avail: 30-urw-aliases.conf
Only in /tmp/2/usr/share/fontconfig/conf.avail: 45-generic.conf

Only in /tmp/2/usr/share/fontconfig/conf.avail: 60-generic.conf
diff -ru /tmp/1/usr/share/fontconfig/conf.avail/90-synthetic.conf /tmp/2/usr/share/fontconfig/conf.avail/90-synthetic.conf
--- /tmp/1/usr/share/fontconfig/conf.avail/90-synthetic.conf	2016-08-24 15:21:57.000000000 +0300
+++ /tmp/2/usr/share/fontconfig/conf.avail/90-synthetic.conf	2018-05-14 11:32:10.000000000 +0300
@@ -40,11 +44,11 @@
 	<match target="font">
 		<!-- check to see if the font is just regular -->
 		<test name="weight" compare="less_eq">
-			<const>medium</const>
+			<const>regular</const>
 		</test>
 		<!-- check to see if the pattern requests bold -->
-		<test target="pattern" name="weight" compare="more">
-			<const>medium</const>
+		<test target="pattern" name="weight" compare="more_eq">
+			<const>bold</const>
 		</test>
 		<!--
 		  set the embolden flag