[evolution] I#417 - Add support for CSS property "-MessageList-new-mail-fg-color"

[Milan Crha <mcrha src gnome org>]

commit 8a549baf157c02bb61396997e89a5f77c7240943
Author: Steven Bakker <sb monkey-mind net>
Date:   Mon May 6 15:21:59 2019 +0200

    I#417 - Add support for CSS property "-MessageList-new-mail-fg-color"
    
    Closes https://gitlab.gnome.org/GNOME/evolution/issues/417

 src/mail/message-list.c | 45 +++++++++++++++++++++++++++++++++++++--------
 1 file changed, 37 insertions(+), 8 deletions(-)
---
diff --git a/src/mail/message-list.c b/src/mail/message-list.c
index b0583fdccb..ecf36b9a88 100644
--- a/src/mail/message-list.c
+++ b/src/mail/message-list.c
@@ -131,6 +131,7 @@ struct _MessageListPrivate {
        GMutex re_prefixes_lock;
 
        GdkRGBA *new_mail_bg_color;
+       gchar *new_mail_fg_color;
 };
 
 /* XXX Plain GNode suffers from O(N) tail insertions, and that won't
@@ -2053,6 +2054,19 @@ ml_tree_value_at_ex (ETreeModel *etm,
                if (!colour)
                        colour = camel_message_info_get_user_tag (msg_info, "color");
 
+               /*
+                * No flags/tags/user color on mail, check for unread status and
+                * "new-mail-fg-color" CSS attribute.
+                */
+               if (!colour && message_list->priv->new_mail_fg_color) {
+                       gboolean saw_unread = FALSE;
+
+                       for_node_and_subtree_if_collapsed (message_list, node, msg_info, unread_foreach, 
&saw_unread);
+
+                       if (saw_unread)
+                               colour = message_list->priv->new_mail_fg_color;
+               }
+
                return (gpointer) colour;
        }
        case COL_ITALIC: {
@@ -2959,16 +2973,23 @@ ml_get_bg_color_cb (ETableItem *item,
 static void
 ml_style_updated_cb (MessageList *message_list)
 {
+       GdkRGBA *new_mail_fg_color = NULL;
+
        g_return_if_fail (IS_MESSAGE_LIST (message_list));
 
-       if (message_list->priv->new_mail_bg_color) {
-               gdk_rgba_free (message_list->priv->new_mail_bg_color);
-               message_list->priv->new_mail_bg_color = NULL;
-       }
+       g_clear_pointer (&message_list->priv->new_mail_bg_color, gdk_rgba_free);
+       g_clear_pointer (&message_list->priv->new_mail_fg_color, g_free);
 
        gtk_widget_style_get (GTK_WIDGET (message_list),
                "new-mail-bg-color", &message_list->priv->new_mail_bg_color,
+               "new-mail-fg-color", &new_mail_fg_color,
                NULL);
+
+       if (new_mail_fg_color) {
+               message_list->priv->new_mail_fg_color = gdk_rgba_to_string (new_mail_fg_color);
+
+               gdk_rgba_free (new_mail_fg_color);
+       }
 }
 
 static void
@@ -3232,10 +3253,8 @@ message_list_finalize (GObject *object)
        if (message_list->priv->tree_model_root != NULL)
                extended_g_node_destroy (message_list->priv->tree_model_root);
 
-       if (message_list->priv->new_mail_bg_color) {
-               gdk_rgba_free (message_list->priv->new_mail_bg_color);
-               message_list->priv->new_mail_bg_color = NULL;
-       }
+       g_clear_pointer (&message_list->priv->new_mail_bg_color, gdk_rgba_free);
+       g_clear_pointer (&message_list->priv->new_mail_fg_color, g_free);
 
        /* Chain up to parent's finalize() method. */
        G_OBJECT_CLASS (message_list_parent_class)->finalize (object);
@@ -3855,6 +3874,15 @@ message_list_class_init (MessageListClass *class)
                        GDK_TYPE_RGBA,
                        G_PARAM_READABLE));
 
+       gtk_widget_class_install_style_property (
+               GTK_WIDGET_CLASS (class),
+               g_param_spec_boxed (
+                       "new-mail-fg-color",
+                       "New Mail Foreground Color",
+                       "Foreground color to use for new mails",
+                       GDK_TYPE_RGBA,
+                       G_PARAM_READABLE));
+
        signals[MESSAGE_SELECTED] = g_signal_new (
                "message_selected",
                MESSAGE_LIST_TYPE,
@@ -3966,6 +3994,7 @@ message_list_init (MessageList *message_list)
        message_list->priv->re_separators = NULL;
        message_list->priv->group_by_threads = TRUE;
        message_list->priv->new_mail_bg_color = NULL;
+       message_list->priv->new_mail_fg_color = NULL;
 }
 
 static void