[gtksourceview/wip/chergert/gsv-gtk4: 159/189] lines: avoid use of style-updated

[Christian Hergert <chergert src gnome org>]

commit a90eff67394a1e0c00d0ca5c464528c02ee53fa0
Author: Christian Hergert <chergert redhat com>
Date:   Tue Mar 17 17:10:35 2020 -0700

    lines: avoid use of style-updated
    
    This API was removed in GTK 4, so we need to drop our use of it. Instead
    we will watch for CSS changes and apply that.
    
    Long term, this will work better as CSS is inhereted from parent widgets
    before 4.0 is released.

 gtksourceview/gtksourcegutterrendererlines.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)
---
diff --git a/gtksourceview/gtksourcegutterrendererlines.c b/gtksourceview/gtksourcegutterrendererlines.c
index 23cc5dfc..67072c49 100644
--- a/gtksourceview/gtksourcegutterrendererlines.c
+++ b/gtksourceview/gtksourcegutterrendererlines.c
@@ -141,9 +141,13 @@ gutter_renderer_change_buffer (GtkSourceGutterRenderer *renderer,
 }
 
 static void
-on_view_style_updated (GtkTextView                  *view,
-                       GtkSourceGutterRendererLines *renderer)
+gtk_source_gutter_renderer_lines_css_changed (GtkWidget         *widget,
+                                              GtkCssStyleChange *change)
 {
+       GtkSourceGutterRendererLines *renderer = GTK_SOURCE_GUTTER_RENDERER_LINES (widget);
+
+       GTK_WIDGET_CLASS (_gtk_source_gutter_renderer_lines_parent_class)->css_changed (widget, change);
+
        /* Force to recalculate the size. */
        renderer->num_line_digits = -1;
        recalculate_size (renderer);
@@ -165,9 +169,6 @@ gutter_renderer_change_view (GtkSourceGutterRenderer *renderer,
 
        if (old_view != NULL)
        {
-               g_signal_handlers_disconnect_by_func (old_view,
-                                                     on_view_style_updated,
-                                                     renderer);
                g_signal_handlers_disconnect_by_func (old_view,
                                                      on_view_notify_cursor_visible,
                                                      renderer);
@@ -177,12 +178,6 @@ gutter_renderer_change_view (GtkSourceGutterRenderer *renderer,
 
        if (new_view != NULL)
        {
-               g_signal_connect_object (new_view,
-                                        "style-updated",
-                                        G_CALLBACK (on_view_style_updated),
-                                        renderer,
-                                        0);
-
                g_signal_connect_object (new_view,
                                         "notify::cursor-visible",
                                         G_CALLBACK (on_view_notify_cursor_visible),
@@ -384,6 +379,7 @@ _gtk_source_gutter_renderer_lines_class_init (GtkSourceGutterRendererLinesClass
        GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
 
        widget_class->measure = gtk_source_gutter_renderer_lines_measure;
+       widget_class->css_changed = gtk_source_gutter_renderer_lines_css_changed;
 
        renderer_class->query_activatable = gutter_renderer_query_activatable;
        renderer_class->query_data = gtk_source_gutter_renderer_lines_query_data;