Add documentation and release notes around 0 Tf issue

TODO

@@ -315,6 +315,10 @@ we might do about it.
   misc/character-encoding/ (not on github) and font metric information
   for the 14 standard fonts in my local pdf-spec directory.
 
+* Once we know about character widths, we can correctly support
+  auto-sized variable text fields (0 Tf). If this is fixed, search for
+  "auto-sized" in cli.rst.
+
 Fuzz Errors
 ===========
 

job.sums

@@ -14,4 +14,4 @@ libqpdf/qpdf/auto_job_json_decl.hh c5e3fd38a3b0c569eb0c6b4c60953a09cd6bc7d3361a3
 libqpdf/qpdf/auto_job_json_init.hh b070350d304d137ba594c1ba40b373137e8459735f04b8ca0f8a2ffd1908c69e
 libqpdf/qpdf/auto_job_schema.hh 18a3780671d95224cb9a27dcac627c421cae509d59f33a63e6bda0ab53cce923
 manual/_ext/qpdf.py e9ac9d6c70642a3d29281ee5ad92ae2422dee8be9306fb8a0bc9dba0ed5e28f3
-manual/cli.rst 2dd5e5a9c0440aea65ed0a2bf6239aa6662afdb463224aafdc116a8a676dbc20
+manual/cli.rst aa44cbe7b6281ee05dc8b19ee1b12ca770503681ffc8ba90e795fc3c3b55153d

manual/cli.rst

@@ -1587,6 +1587,10 @@ Related Options
      :command:`qpdf` does not know enough about fonts and encodings to
      correctly represent characters that fall outside of this range.
 
+   - For variable text fields where the default appearance stream
+     specifies that the font should be auto-sized, a fixed font size
+     is used rather than calculating the font size.
+
    - Quadding is ignored. Quadding is used to specify whether the
      contents of a field should be left, center, or right aligned with
      the field.

manual/release-notes.rst

@@ -6,6 +6,14 @@ Release Notes
 For a detailed list of changes, please see the file
 :file:`ChangeLog` in the source distribution.
 
+10.6.3: XXX
+  - Bug fixes:
+
+    - Fix edge cases with appearance stream generation for form fields
+      whose ``/DA`` field lacks proper font size specification or that
+      specifies auto sizing. At this time, qpdf does not support auto
+      sizing.
+
 10.6.2: February 16, 2022
   - Bug fixes: