[gtk/wip/exalm/textview-selection: 3/4] textview: Invalidate selection when its style changes

[Alexander Mikhaylenko <alexm src gnome org>]

commit 9aca7f0cb85b4d172680adfe7a407ab15f04d5bc
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Mon May 3 21:40:37 2021 +0500

    textview: Invalidate selection when its style changes

 gtk/gtktextlayout.c        | 14 ++++++++++++++
 gtk/gtktextlayoutprivate.h |  1 +
 gtk/gtktextview.c          | 15 +++++++++++++++
 3 files changed, 30 insertions(+)
---
diff --git a/gtk/gtktextlayout.c b/gtk/gtktextlayout.c
index c746752be5..aad63f6333 100644
--- a/gtk/gtktextlayout.c
+++ b/gtk/gtktextlayout.c
@@ -833,6 +833,20 @@ gtk_text_layout_invalidate_cursors (GtkTextLayout     *layout,
   gtk_text_layout_invalidated (layout);
 }
 
+void
+gtk_text_layout_invalidate_selection (GtkTextLayout *layout)
+{
+  GtkTextIter selection_start, selection_end;
+
+  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
+
+  if (layout->buffer &&
+      gtk_text_buffer_get_selection_bounds (layout->buffer,
+                                            &selection_start,
+                                            &selection_end))
+    gtk_text_layout_invalidate (layout, &selection_start, &selection_end);
+}
+
 void
 gtk_text_layout_free_line_data (GtkTextLayout   *layout,
                                 GtkTextLine     *line,
diff --git a/gtk/gtktextlayoutprivate.h b/gtk/gtktextlayoutprivate.h
index 66676c7e7a..480d1ada62 100644
--- a/gtk/gtktextlayoutprivate.h
+++ b/gtk/gtktextlayoutprivate.h
@@ -287,6 +287,7 @@ void gtk_text_layout_invalidate        (GtkTextLayout     *layout,
 void gtk_text_layout_invalidate_cursors(GtkTextLayout     *layout,
                                         const GtkTextIter *start,
                                         const GtkTextIter *end);
+void gtk_text_layout_invalidate_selection (GtkTextLayout  *layout);
 void gtk_text_layout_free_line_data    (GtkTextLayout     *layout,
                                         GtkTextLine       *line,
                                         GtkTextLineData   *line_data);
diff --git a/gtk/gtktextview.c b/gtk/gtktextview.c
index 33c40d3555..fd62f3bba1 100644
--- a/gtk/gtktextview.c
+++ b/gtk/gtktextview.c
@@ -1917,6 +1917,20 @@ _gtk_text_view_ensure_text_handles (GtkTextView *text_view)
     }
 }
 
+static void
+selection_node_style_changed_cb (GtkCssNode        *node,
+                                 GtkCssStyleChange *change,
+                                 GtkWidget         *widget)
+{
+  GtkTextView *text_view = GTK_TEXT_VIEW (widget);
+  GtkTextViewPrivate *priv = text_view->priv;
+
+  if (!priv->layout)
+    return;
+
+  gtk_text_layout_invalidate_selection (priv->layout);
+}
+
 static void
 gtk_text_view_init (GtkTextView *text_view)
 {
@@ -2030,6 +2044,7 @@ gtk_text_view_init (GtkTextView *text_view)
   gtk_css_node_set_state (priv->selection_node,
                           gtk_css_node_get_state (priv->text_window->css_node) & 
~GTK_STATE_FLAG_DROP_ACTIVE);
   gtk_css_node_set_visible (priv->selection_node, FALSE);
+  g_signal_connect_object (priv->selection_node, "style-changed", G_CALLBACK 
(selection_node_style_changed_cb), widget, 0);
   g_object_unref (priv->selection_node);
 
   gtk_widget_action_set_enabled (GTK_WIDGET (text_view), "text.can-redo", FALSE);