[gnome-builder/wip/gtk4-port] libide/sourceview: add simplified scroll to insert

[Christian Hergert <chergert src gnome org>]

commit 235e4a283ab500e9e947884673eeb430a74cf7a7
Author: Christian Hergert <chergert redhat com>
Date:   Sat Apr 2 02:28:30 2022 -0700

    libide/sourceview: add simplified scroll to insert
    
    We want this abstracted from textview because we'll need our own margin
    control for use with the "scroll offset" feature if it's to be ported
    to GTK 4.

 src/libide/sourceview/ide-source-view.c | 17 +++++++++++++++++
 src/libide/sourceview/ide-source-view.h |  4 +++-
 2 files changed, 20 insertions(+), 1 deletion(-)
---
diff --git a/src/libide/sourceview/ide-source-view.c b/src/libide/sourceview/ide-source-view.c
index 70270601b..dae1ed925 100644
--- a/src/libide/sourceview/ide-source-view.c
+++ b/src/libide/sourceview/ide-source-view.c
@@ -95,3 +95,20 @@ static void
 ide_source_view_init (IdeSourceView *self)
 {
 }
+
+void
+ide_source_view_scroll_to_insert (IdeSourceView *self)
+{
+  GtkTextBuffer *buffer;
+  GtkTextView *view;
+  GtkTextMark *mark;
+
+  g_return_if_fail (IDE_IS_SOURCE_VIEW (self));
+
+  view = GTK_TEXT_VIEW (self);
+  buffer = gtk_text_view_get_buffer (view);
+  mark = gtk_text_buffer_get_insert (buffer);
+
+  /* TODO: use margin to implement  "scroll offset" */
+  gtk_text_view_scroll_to_mark (view, mark, .5, FALSE, .0, .0);
+}
diff --git a/src/libide/sourceview/ide-source-view.h b/src/libide/sourceview/ide-source-view.h
index 445da7e7f..f2ebef5c3 100644
--- a/src/libide/sourceview/ide-source-view.h
+++ b/src/libide/sourceview/ide-source-view.h
@@ -32,6 +32,8 @@ IDE_AVAILABLE_IN_ALL
 G_DECLARE_FINAL_TYPE (IdeSourceView, ide_source_view, IDE, SOURCE_VIEW, GtkSourceView)
 
 IDE_AVAILABLE_IN_ALL
-GtkWidget *ide_source_view_new (void);
+GtkWidget *ide_source_view_new              (void);
+IDE_AVAILABLE_IN_ALL
+void       ide_source_view_scroll_to_insert (IdeSourceView *self);
 
 G_END_DECLS