[tepl] SpaceDrawerPrefs: add information label

[Sébastien Wilmet <swilmet src gnome org>]

commit e05d2ce16b4b7038086c0705b0610ed1f1c61460
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Sep 28 17:22:05 2020 +0200

    SpaceDrawerPrefs: add information label

 tepl/tepl-space-drawer-prefs.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
---
diff --git a/tepl/tepl-space-drawer-prefs.c b/tepl/tepl-space-drawer-prefs.c
index c777342..2e3a5e4 100644
--- a/tepl/tepl-space-drawer-prefs.c
+++ b/tepl/tepl-space-drawer-prefs.c
@@ -305,6 +305,26 @@ add_result_viewer (TeplSpaceDrawerPrefs *prefs)
        gtk_container_add (GTK_CONTAINER (prefs->priv->second_column_vgrid), scrolled_window);
 }
 
+static void
+add_information (TeplSpaceDrawerPrefs *prefs)
+{
+       GtkLabel *label;
+
+       gtk_container_add (GTK_CONTAINER (prefs->priv->second_column_vgrid),
+                          create_subtitle_label (_("Information")));
+
+       label = GTK_LABEL (gtk_label_new (_("When white space drawing is enabled, then non-breaking "
+                                           "spaces are always drawn at all locations, to distinguish "
+                                           "them from normal spaces.")));
+       gtk_widget_set_margin_start (GTK_WIDGET (label), 12);
+       gtk_widget_set_halign (GTK_WIDGET (label), GTK_ALIGN_START);
+       gtk_label_set_xalign (label, 0.0);
+       gtk_label_set_line_wrap (label, TRUE);
+       gtk_label_set_selectable (label, TRUE);
+       gtk_label_set_max_width_chars (label, 60);
+       gtk_container_add (GTK_CONTAINER (prefs->priv->second_column_vgrid), GTK_WIDGET (label));
+}
+
 static void
 tepl_space_drawer_prefs_init (TeplSpaceDrawerPrefs *prefs)
 {
@@ -338,6 +358,7 @@ tepl_space_drawer_prefs_init (TeplSpaceDrawerPrefs *prefs)
        gtk_grid_set_row_spacing (prefs->priv->second_column_vgrid, 6);
        gtk_container_add (GTK_CONTAINER (prefs), GTK_WIDGET (prefs->priv->second_column_vgrid));
        add_result_viewer (prefs);
+       add_information (prefs);
        gtk_widget_show_all (GTK_WIDGET (prefs->priv->second_column_vgrid));
 }