[gnumeric] ods: read localc extension for engineering format

[Morten Welinder <mortenw src gnome org>]

commit 77da4357464c587b9f004ea786488e764378d282
Author: Morten Welinder <terra gnome org>
Date:   Wed Aug 31 20:34:09 2022 -0400

    ods: read localc extension for engineering format
    
    The file format is deficient, so everyone comes up with their own
    extension for this.  What great fun that is!

 NEWS                                 | 1 +
 plugins/openoffice/ChangeLog         | 5 +++++
 plugins/openoffice/openoffice-read.c | 5 ++++-
 3 files changed, 10 insertions(+), 1 deletion(-)
---
diff --git a/NEWS b/NEWS
index ed497e571..7e81922f6 100644
--- a/NEWS
+++ b/NEWS
@@ -11,6 +11,7 @@ Morten:
        * Fix sc import problem.  [#663]
        * Work a little hard at avoiding -0.  [#652]
        * Fix html import problem.  [#669]
+       * Fix reading localc extension for engineering format.  [#659]
 
 --------------------------------------------------------------------------
 Gnumeric 1.12.52
diff --git a/plugins/openoffice/ChangeLog b/plugins/openoffice/ChangeLog
index 050767f34..510aa3b3f 100644
--- a/plugins/openoffice/ChangeLog
+++ b/plugins/openoffice/ChangeLog
@@ -1,3 +1,8 @@
+2022-08-31  Morten Welinder  <terra gnome org>
+
+       * openoffice-read.c (odf_scientific): Read localc-style
+       engineering format.
+
 2022-04-18  Morten Welinder <terra gnome org>
 
        * Release 1.12.52
diff --git a/plugins/openoffice/openoffice-read.c b/plugins/openoffice/openoffice-read.c
index e59fb48a5..325787bc5 100644
--- a/plugins/openoffice/openoffice-read.c
+++ b/plugins/openoffice/openoffice-read.c
@@ -5585,7 +5585,10 @@ odf_scientific (GsfXMLIn *xin, xmlChar const **attrs)
                        ;
                else if (oo_attr_bool (xin, attrs, OO_GNUM_NS_EXT, "engineering",
                                       &engineering))
-                       ;
+                       ; // engineering format, Gnumeric-style
+               else if (oo_attr_int (xin, attrs, OO_NS_LOCALC_EXT, "exponent-interval",
+                                     &details->exponent_step))
+                       ; // engineering format, Localc-style
                else if (oo_attr_bool (xin, attrs, OO_GNUM_NS_EXT, "literal-E",
                                       &use_literal_E));
        if (engineering)