[gnumeric] xlsx: allow negative axis value scaling too.

[Morten Welinder <mortenw src gnome org>]

commit ec2ae796e273d36e34e771b1993aa5efee0b25ea
Author: Morten Welinder <terra gnome org>
Date:   Mon May 4 10:52:57 2015 -0400

    xlsx: allow negative axis value scaling too.
    
    The spec allows it; it might be useful.

 plugins/excel/ChangeLog           |    8 +++++++-
 plugins/excel/xlsx-read-drawing.c |    2 +-
 2 files changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/plugins/excel/ChangeLog b/plugins/excel/ChangeLog
index d8555d1..862efc9 100644
--- a/plugins/excel/ChangeLog
+++ b/plugins/excel/ChangeLog
@@ -1,6 +1,12 @@
+2015-05-04  Morten Welinder  <terra gnome org>
+
+       * xlsx-read-drawing.c (xlsx_axis_custom_unit): Allow negative
+       units too.
+
 2015-05-04  Jean Brefort  <jean brefort normalesup org>
 
-       * xlsx-read-drawing.c (xlsx_axis_custom_unit): read custom scaling factor.
+       * xlsx-read-drawing.c (xlsx_axis_custom_unit): read custom scaling
+       factor.
        * xlsx-write-drawing.c (xlsx_write_axis): write it back. [#748295]
 
 2015-04-28  Morten Welinder  <terra gnome org>
diff --git a/plugins/excel/xlsx-read-drawing.c b/plugins/excel/xlsx-read-drawing.c
index f82478f..c078019 100644
--- a/plugins/excel/xlsx-read-drawing.c
+++ b/plugins/excel/xlsx-read-drawing.c
@@ -1081,7 +1081,7 @@ xlsx_axis_custom_unit (GsfXMLIn *xin, xmlChar const **attrs)
 {
        XLSXReadState *state = (XLSXReadState *)xin->user_state;
        double f;
-       if (state->axis.obj && attr_float (xin, attrs, "val", &f) && f > 0.)
+       if (state->axis.obj && attr_float (xin, attrs, "val", &f) && f != 0)
                g_object_set (state->axis.obj, "display-factor", f, NULL);
 }