[Fontconfig-bugs] [Bug 101820] New: fontconfig cache creation takes a long time during GIMP startup

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101820

            Bug ID: 101820
           Summary: fontconfig cache creation takes a long time during
                    GIMP startup
           Product: fontconfig
           Version: unspecified
          Hardware: Other
                OS: Windows (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: library
          Assignee: fontconfig-bugs at lists.freedesktop.org
          Reporter: schumaml at gmx.de
        QA Contact: freedesktop at behdad.org

On Microsoft Windows platforms, the first start of an application using
fontconfig can be the first time the fontconfig cache is actually created.

For GIMP, we get the occasionally bug report that this takes a very long time
on startup, on every DST change (due to how MS Windows reports file
modification dates), and sometimes "every time".

We take that last one with several grains of salt, because "every time" may
just be "I noticed it the last time I started GIMP, and oops it doesn't happen
just now...".

Anyway, in bug https://bugzilla.gnome.org/show_bug.cgi?id=782676 there is a
description of what is happening to some users upgrading to GIMP 2.8.22 right
now - including a copy of the fontconfig cache folder which allows to reproduce
the issue.

Maybe someone working on fontconfig can shed some light on the issue, and tells
us whether this is an issue in fontconfig, or in the way it is packaged in the
GIMP installers, or the way it is used by GIMP?

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