[perl-Gtk2] Add an explanatory comment to one example

[Torsten Schönfeld <tsch src gnome org>]

commit 28064c1feb6e24df1aa5377695c3280b5874a4f1
Author: Torsten Schönfeld <kaffeetisch gmx de>
Date:   Sun Apr 11 16:38:36 2010 +0200

    Add an explanatory comment to one example
    
    Explain why setting an explicit height request on the cell editable is
    necessary.

 examples/customrenderer.pl |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/examples/customrenderer.pl b/examples/customrenderer.pl
index b6a4548..f9d7237 100644
--- a/examples/customrenderer.pl
+++ b/examples/customrenderer.pl
@@ -93,7 +93,10 @@ sub START_EDITING {
 		return FALSE;
 	});
 
+	# Make sure the entry has the correct height.  On some versions of
+	# gtk+, the entry would otherwise be just a few pixels tall.
 	$entry->set (height_request => $cell_area->height);
+
 	$entry->show;
 
 	return $entry;