[gnome-builder/wip/gtk4-port] plugins/debuggerui: scroll to breakpoint upon root

[Christian Hergert <chergert src gnome org>]

commit a2df92443a4103f13e8536e33d6607cfb5357088
Author: Christian Hergert <chergert redhat com>
Date:   Mon May 23 13:37:22 2022 -0700

    plugins/debuggerui: scroll to breakpoint upon root
    
    We have to wait until the widget has rooted to be able to scroll to this
    position, so delay until there and then bring the insert mark into the
    proper position onscreen.

 .../debuggerui/ide-debugger-disassembly-view.c     | 34 ++++++++++++++++++++++
 1 file changed, 34 insertions(+)
---
diff --git a/src/plugins/debuggerui/ide-debugger-disassembly-view.c 
b/src/plugins/debuggerui/ide-debugger-disassembly-view.c
index b9cd5348c..692ed14ab 100644
--- a/src/plugins/debuggerui/ide-debugger-disassembly-view.c
+++ b/src/plugins/debuggerui/ide-debugger-disassembly-view.c
@@ -125,6 +125,38 @@ notify_style_scheme_cb (IdeDebuggerDisassemblyView *self,
   setup_breakpoint_tag (self);
 }
 
+static gboolean
+scroll_to_insert_in_idle_cb (gpointer user_data)
+{
+  IdeDebuggerDisassemblyView *self = user_data;
+  GtkTextMark *mark;
+  GtkTextIter iter;
+
+  g_assert (IDE_IS_DEBUGGER_DISASSEMBLY_VIEW (self));
+
+  mark = gtk_text_buffer_get_insert (GTK_TEXT_BUFFER (self->source_buffer));
+  gtk_text_buffer_get_iter_at_mark (GTK_TEXT_BUFFER (self->source_buffer), &iter, mark);
+  ide_source_view_jump_to_iter (GTK_TEXT_VIEW (self->source_view), &iter,
+                                0.0, TRUE, 1.0, 0.5);
+
+  return G_SOURCE_REMOVE;
+}
+
+static void
+ide_debugger_disassembly_view_root (GtkWidget *widget)
+{
+  IdeDebuggerDisassemblyView *self = (IdeDebuggerDisassemblyView *)widget;
+
+  g_assert (IDE_IS_DEBUGGER_DISASSEMBLY_VIEW (self));
+
+  GTK_WIDGET_CLASS (ide_debugger_disassembly_view_parent_class)->root (widget);
+
+  g_idle_add_full (G_PRIORITY_LOW,
+                   scroll_to_insert_in_idle_cb,
+                   g_object_ref (self),
+                   g_object_unref);
+}
+
 static void
 ide_debugger_disassembly_view_dispose (GObject *object)
 {
@@ -143,6 +175,8 @@ ide_debugger_disassembly_view_class_init (IdeDebuggerDisassemblyViewClass *klass
 
   object_class->dispose = ide_debugger_disassembly_view_dispose;
 
+  widget_class->root = ide_debugger_disassembly_view_root;
+
   gtk_widget_class_set_template_from_resource (widget_class, 
"/plugins/debuggerui/ide-debugger-disassembly-view.ui");
   gtk_widget_class_bind_template_child (widget_class, IdeDebuggerDisassemblyView, source_buffer);
   gtk_widget_class_bind_template_child (widget_class, IdeDebuggerDisassemblyView, source_view);