List system fonts files

app/src/main/java/eu/faircode/email/FragmentOptionsMisc.java

@@ -31,6 +31,8 @@ import android.content.pm.PermissionInfo;
 import android.database.sqlite.SQLiteDatabaseCorruptException;
 import android.graphics.Paint;
 import android.graphics.Typeface;
+import android.graphics.fonts.Font;
+import android.graphics.fonts.SystemFonts;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Debug;
@@ -1136,6 +1138,12 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
                     ssb.append(ex.toString());
                 }
 
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                    ssb.append("\n");
+                    for (Font font : SystemFonts.getAvailableFonts())
+                        ssb.append(font.getFile().getName()).append("\n");
+                }
+
                 new AlertDialog.Builder(getContext())
                         .setIcon(R.drawable.twotone_info_24)
                         .setTitle(R.string.title_advanced_font_map)