backport fix for #2453 add fallback character for placeholder charact…

…er when using AFM font

CHANGELOG.adoc

@@ -11,6 +11,7 @@ Bug Fixes::
 
 * show dot leaders in TOC entry if toclevels is increased for a given section (#2441)
 * decouple tests from path of PWD (#2444)
+* add fallback character for placeholder character when using AFM font (#2453)
 
 == 2.3.9 (2023-06-28) - @mojavelinux
 

lib/asciidoctor/pdf/ext/prawn/font/afm.rb

@@ -7,6 +7,7 @@ class Prawn::Font::AFM
     ?\u200b => '',
     ?\u202f => ?\u00a0,
     ?\u2009 => ' ',
+    ?\u2063 => ?\u00ad,
     ?\u25e6 => '-',
     ?\u25aa => ?\u00b7,
   }

spec/image_spec.rb

@@ -2165,6 +2165,21 @@ def traverse node
       (expect to_file).to visually_match 'image-inline-scale-down-height.pdf'
     end
 
+    it 'should not warn about missing glyph for image placeholder char when using AFM font' do
+      (expect do
+        pdf = to_pdf <<~'END', attribute_overrides: { 'pdf-theme' => 'base' }, analyze: :image
+        :pdf-page-size: A6
+        :pdf-page-layout: landscape
+
+        before
+
+        image:square.png[pdfwidth=7cm]
+        END
+        (expect (images = pdf.images)).to have_size 1
+        (expect images[0][:page_number]).to be 2
+      end).to not_log_message using_log_level: :INFO
+    end
+
     it 'should scale image down to fit available height inside delimited block', visual: true do
       to_file = to_pdf_file <<~'EOS', 'image-inline-in-block-scale-down-height.pdf'
       :pdf-page-size: A6