[gimp/gimp-2-10] plug-ins: fix #8508 Print exporting to PSD seems to export as cm ...

[Jacob Boerema <jboerema src gnome org>]

commit 12de7b8a971473ca55f8605f837c5db838a1f006
Author: Jacob Boerema <jgboerema gmail com>
Date:   Wed Aug 24 13:58:27 2022 -0400

    plug-ins: fix #8508 Print exporting to PSD seems to export as cm ...
    
    and import as inches
    
    When GIMP's display unit was mm, our PSD export converted the X and Y
    resolution as if a conversion from mm to inch was needed.
    
    However, PSD's resolution is always measured in pixels per inch, so a
    conversion is never necessary.
    Removing the conversion, resolves the issue.
    
    (cherry picked from commit 24886f91b1e55ab2f79327a00bb53729ddfde7b9)

 plug-ins/file-psd/psd-save.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/plug-ins/file-psd/psd-save.c b/plug-ins/file-psd/psd-save.c
index 2cdd4c81cd..1adb48c137 100644
--- a/plug-ins/file-psd/psd-save.c
+++ b/plug-ins/file-psd/psd-save.c
@@ -813,11 +813,6 @@ save_resources (FILE   *fd,
 
     if (g_unit == GIMP_UNIT_MM)
       {
-        gdouble factor = gimp_unit_get_factor (g_unit) / 10.0;
-
-        xres /= factor;
-        yres /= factor;
-
         psd_unit = PSD_UNIT_CM;
       }
     else
@@ -825,6 +820,8 @@ save_resources (FILE   *fd,
         psd_unit = PSD_UNIT_INCH;
       }
 
+    /* Don't convert resolution based on g_unit which is a display unit.
+     * PSD resolution is always in pixels/inch. */
     xres_fix = xres * 65536.0 + .5; /* Convert to 16.16 fixed point */
     yres_fix = yres * 65536.0 + .5; /* Convert to 16.16 fixed point */