[gtksourceview/wip/chergert/gsv-gtk4] words: implement activate for word completion

[Christian Hergert <chergert src gnome org>]

commit 15998fe750f501848cb5b0765a0bba98e16d810b
Author: Christian Hergert <chergert redhat com>
Date:   Tue Sep 1 15:26:19 2020 -0700

    words: implement activate for word completion

 .../words/gtksourcecompletionwords.c               | 25 ++++++++++++++++++++++
 1 file changed, 25 insertions(+)
---
diff --git a/gtksourceview/completion-providers/words/gtksourcecompletionwords.c 
b/gtksourceview/completion-providers/words/gtksourcecompletionwords.c
index 644936e1..21e91c71 100644
--- a/gtksourceview/completion-providers/words/gtksourcecompletionwords.c
+++ b/gtksourceview/completion-providers/words/gtksourcecompletionwords.c
@@ -474,6 +474,30 @@ gtk_source_completion_words_display (GtkSourceCompletionProvider *provider,
        }
 }
 
+static void
+gtk_source_completion_words_activate (GtkSourceCompletionProvider *provider,
+                                      GtkSourceCompletionContext  *context,
+                                      GtkSourceCompletionProposal *proposal)
+{
+       GtkSourceCompletionWordsProposal *p = (GtkSourceCompletionWordsProposal *)proposal;
+       GtkTextIter begin, end;
+
+       g_assert (GTK_SOURCE_IS_COMPLETION_WORDS (provider));
+       g_assert (GTK_SOURCE_IS_COMPLETION_CONTEXT (context));
+       g_assert (GTK_SOURCE_IS_COMPLETION_WORDS_PROPOSAL (p));
+
+       if (gtk_source_completion_context_get_bounds (context, &begin, &end))
+       {
+               GtkTextBuffer *buffer = gtk_text_iter_get_buffer (&begin);
+               const char *word = gtk_source_completion_words_proposal_get_word (p);
+
+               gtk_text_buffer_begin_user_action (GTK_TEXT_BUFFER (buffer));
+               gtk_text_buffer_delete (GTK_TEXT_BUFFER (buffer), &begin, &end);
+               gtk_text_buffer_insert (GTK_TEXT_BUFFER (buffer), &begin, word, -1);
+               gtk_text_buffer_end_user_action (GTK_TEXT_BUFFER (buffer));
+       }
+}
+
 static void
 gtk_source_completion_words_iface_init (GtkSourceCompletionProviderInterface *iface)
 {
@@ -482,6 +506,7 @@ gtk_source_completion_words_iface_init (GtkSourceCompletionProviderInterface *if
        iface->populate_finish = gtk_source_completion_words_populate_finish;
        iface->get_priority = gtk_source_completion_words_get_priority;
        iface->display = gtk_source_completion_words_display;
+       iface->activate = gtk_source_completion_words_activate;
 }
 
 static void