[goffice] ColorSelector: don't let the colour areas expand

[Morten Welinder <mortenw src gnome org>]

commit 376dabd9e34848098a500dc5c017b632df7683a4
Author: Morten Welinder <terra gnome org>
Date:   Sun Dec 3 15:02:12 2017 -0500

    ColorSelector: don't let the colour areas expand
    
    ...because then they will do it independently for x and y directions.

 goffice/gtk/go-color-palette.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/goffice/gtk/go-color-palette.c b/goffice/gtk/go-color-palette.c
index 34bbc0e..453ffd8 100644
--- a/goffice/gtk/go-color-palette.c
+++ b/goffice/gtk/go-color-palette.c
@@ -242,6 +242,10 @@ go_color_palette_class_init (GObjectClass *gobject_class)
                              NULL, NULL,
                              g_cclosure_marshal_VOID__OBJECT,
                              G_TYPE_NONE, 1, G_TYPE_OBJECT);
+
+#ifdef HAVE_GTK_WIDGET_CLASS_SET_CSS_NAME
+       gtk_widget_class_set_css_name ((GtkWidgetClass *)gobject_class, "colorpalette");
+#endif
 }
 
 static void
@@ -371,6 +375,8 @@ go_color_palette_button_new (GOColorPalette *pal, GtkGrid *grid,
        g_object_set_data (G_OBJECT (swatch), "color",
                           GUINT_TO_POINTER (color_name->color));
        gtk_widget_set_size_request (swatch, COLOR_PREVIEW_WIDTH, COLOR_PREVIEW_HEIGHT);
+       gtk_widget_set_halign (swatch, GTK_ALIGN_CENTER);
+       gtk_widget_set_valign (swatch, GTK_ALIGN_CENTER);
 
        /* Wrap inside a vbox with a border so that we can see the focus indicator */
        box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);