[Fontconfig-bugs] [Bug 53323] New: objects for target="pattern" is inherited to the result of FcMatchFont

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=53323

             Bug #: 53323
           Summary: objects for target="pattern" is inherited to the
                    result of FcMatchFont
    Classification: Unclassified
           Product: fontconfig
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: library
        AssignedTo: fontconfig-bugs at lists.freedesktop.org
        ReportedBy: akira at tagoh.org
         QAContact: freedesktop at behdad.org


The quote from the document:

        use rgb sub-pixel ordering to improve glyph appearance on
        LCD screens.  Changes affecting rendering, but not matching
        should always use target="font".

So the following rule should be affected to the result of FcPattern for
FcMatchFont:

<match target="pattern">
  <edit name="rgba" mode="assign">
    <const>rgb</const>
  </edit>
</match>

but it does:
$ fc-match -v | grep rgba
        rgba: 1(i)(s)

This behavior messes up the rule of target="font".

Aside from that, right now fontconfig warns when editing the user-defined
object on target="scan" though, we should do it for others if it's not
desirable and for target="pattern" and target="font" too.

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