[bug #48904] Hyphenation patterns of type '.a[135]' do not work

[G. Branden Robinson]

Update of bug #48904 (project groff):

                Category:                    None => Core                   
              Item Group:                    None => Incorrect behaviour    

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Follow-up Comment #7:


commit b5aaab51158255411fd196b43f70f45dda511a42
Author: Werner Lemberg <wl@gnu.org>
Date:   Thu Mar 1 20:17:21 2018 +0100

    Fix some problems related to hyphenation.

diff --git a/ChangeLog b/ChangeLog
index 1506e57dd..9ce1d1d04 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,26 @@
+2018-03-01  Werner LEMBERG  <wl@gnu.org>
+
+       Fix some problems related to hyphenation.
+
+       Introduce values 16 (allow hyphenation before last character) and 32
+       (allow hyphenation before first character) to the `hy' request
+       (#48904).
+
+       Really fix problem reported in issue #48904.
+
+       Fix #53243, which is a regression introduced in 2016-09-09.
+
+       * src/roff/troff/env.cpp (HYPHEN_LAST_CHAR, HYPHEN_FIRST_CHAR): New
+       enumeration values.
+       (hyphenate_request): Check for contradicting values.
+       (environment::hyphenate_line): Fix minimum word length considered
+       for hyphenation.
+       (environment::print_env): Updated.
+       (hyphenate): Fix and extend logic.  The original patch to handle
+       #48904 was bad.
+
+       * doc/groff.texi, man/groff_diff.7.man, NEWS: Updated.


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