[gspell] TextIter: add comment about GtkEntry support

[Sébastien Wilmet <swilmet src gnome org>]

commit a406ca2e3f6ee3ffbc20599906b103bdfaec29dc
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Wed Dec 21 18:24:35 2016 +0100

    TextIter: add comment about GtkEntry support

 gspell/gspell-text-iter.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gspell/gspell-text-iter.c b/gspell/gspell-text-iter.c
index fee1091..3c1ca8a 100644
--- a/gspell/gspell-text-iter.c
+++ b/gspell/gspell-text-iter.c
@@ -40,6 +40,9 @@
  * the apostrophe. The implementation would be slightly more complicated, since
  * a function behavior depends on the other side of the word.
  *
+ * When doing changes to the algo here, it should be reflected for the GtkEntry
+ * support as well, to have a consistent behavior.
+ *
  * If the following Pango bug is fixed, the gtk_text_iter_* functions can maybe
  * be used directly.
  * FIXME: https://bugzilla.gnome.org/show_bug.cgi?id=97545