[bugzilla-gnome-org-extensions] Fix problem with commenting on blank lines at start of segment

[Krzesimir Nowak <krnowak src gnome org>]

commit 25de09af9c8407394a70b9ae731fc22f24d174d7
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Tue Oct 27 10:37:17 2009 -0400

    Fix problem with commenting on blank lines at start of segment
    
    If the comment is on blank lines at the start of a segment, we would
    naturally remove all the lines, but we want to leave one since every
    comment is supposed to be about some line; a range like +49,0 to
    indicate a comment between lines 48 and 49 doesn't make sense.
    (We could handle it in the parser but this is simpler.)
    
    Reported by Marina Zhurakhinskaya
    https://bugzilla.gnome.org/show_bug.cgi?id=599693

 js/review.js |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/js/review.js b/js/review.js
index 2899e6e..30917b4 100644
--- a/js/review.js
+++ b/js/review.js
@@ -185,8 +185,9 @@ File.prototype = {
             // Sort them into global order ' ', '-', '+'
             patchLines.sort(_compareSegmentLines);
 
-            // Completely blank context isn't useful so remove it
-            while (patchLines[0].match(/^\s*$/)) {
+            // Completely blank context isn't useful so remove it; however if we are commenting
+            // on blank lines at the start of a segment, we have to leave something or things break
+            while (patchLines.length > 1 && patchLines[0].match(/^\s*$/)) {
                 patchLines.shift();
                 patchOldStart++;
                 patchNewStart++;