Redmine

It does not seem to have any problems when I use Acrobat Reader to open the files.
When I use rbpdf 1.18.7, there is not any problem when viewing PDF files on Microsoft Edge browser.

• Redmine 2.6-3.1 (rbpdf 1.18.x) uses embedded fonts. (see #17570)
  This is a method of embedding all specified fonts, so the file size will be as large as several MB.

• Redmine 3.2-trunk (rbpdf 1.19.x) uses embedded subset-fonts. (see #19017)
  This is a method of embedding only the character to be used, and the file size becomes as small as 100 KB.

If PDF generated by rbpdf 1.19.x (subset font) is displayed in Acrobat Reader, I think there is a problem with subset font processing of Microsoft Edge browser.

If you do not want to use the subset font in Redmine 3.4.5.stable (rbpdf 1.19.x), you can apply it by applying the following patch.

$ diff lib/redmine/export/pdf.rb_org lib/redmine/export/pdf.rb -u
--- lib/redmine/export/pdf.rb_org    2018-05-19 20:23:10.036061097 +0900
+++ lib/redmine/export/pdf.rb    2018-05-19 19:20:06.752736171 +0900
@@ -31,6 +31,9 @@
           FileUtils.mkdir_p @@k_path_cache unless File::exist?(@@k_path_cache)
           set_language_if_valid lang
           super(orientation, 'mm', 'A4')
+
+          set_font_subsetting(false)
+
           set_print_header(false)
           set_rtl(l(:direction) == 'rtl')