From 50778f29461a6745f211f545a049f220aaaaae2b Mon Sep 17 00:00:00 2001
From: "Michael A. Sinclair" <squattingmonk@gmail.com>
Date: Tue, 8 Sep 2026 03:36:00 -0500
Subject: [PATCH] fixes #26183; wordwrap: flush lastSep before splitting an
 overlong word (#26184)

wrapWords(splitLongWords = true) dropped the separator before a word it
had to split, fusing it with the word before it. Flush lastSep first,
the same as the branch that handles a word which fits.

Updates twordwrap's longlongwordRes fixture, which was pinned against
the old behavior at three points where a source line break normalizes to
a synthetic space.
---
 lib/std/wordwrap.nim       | 2 ++
 tests/stdlib/twordwrap.nim | 6 +++---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/std/wordwrap.nim b/lib/std/wordwrap.nim
index 9333f880be..7816d26dab 100644
--- a/lib/std/wordwrap.nim
+++ b/lib/std/wordwrap.nim
@@ -53,6 +53,8 @@ proc wrapWords*(s: string, maxLineWidth = 80,
       let wlen = olen(s, i, j)
       if wlen > spaceLeft:
         if splitLongWords and wlen > maxLineWidth:
+          if lastSep.len > 0 and spaceLeft > 0:
+            result.add(lastSep)
           var k = 0
           while k < j - i:
             if spaceLeft <= 0:
diff --git a/tests/stdlib/twordwrap.nim b/tests/stdlib/twordwrap.nim
index 5d49477d3a..bd99735c6f 100644
--- a/tests/stdlib/twordwrap.nim
+++ b/tests/stdlib/twordwrap.nim
@@ -29,11 +29,11 @@ iaoenvlcyfglwckßqfgvwkßqgfvlwkßqfgvlwckßqvlwkgfUIαοιαοιαχολωχσ
 ξχλωωχαοεοιαεοαεοιαεοαεοιαοεσναοεκνρκψγκψφϵιηαααοε"""
 let longlongwordRes = """
 abc uitdaeröägfßhydüäpydqfü,träpydqgpmüdträpydföägpydörztdüöäfguiaeowäzjdtrüöäp
-psnrtuiydrözenrüöäpyfdqazpesnrtulocjtüöäzydgyqgfqfgprtnwjlcydkqgfüöezmäzydydqüü
+psnrtuiydrözenrüöäpyfdqazpesnrtulocjtüö äzydgyqgfqfgprtnwjlcydkqgfüöezmäzydydqüü
 öäpdtrnvwfhgckdumböäpydfgtdgfhtdrntdrntydfogiayqfguiatrnydrntüöärtniaoeydfgaoeiq
-fglwcßqfgxvlcwgtfhiaoenrsüöäapmböäptdrniaoydfglckqfhouenrtsüöäptrniaoeyqfgulocf
+fglwcßqfgxvlcwgtfhiaoen rsüöäapmböäptdrniaoydfglckqfhouenrtsüöäptrniaoeyqfgulocf
 qclgwxßqflgcwßqfxglcwrniatrnmüböäpmöäbpümöäbpüöämpbaoestnriaesnrtdiaesrtdniaesdr
-tnaetdriaoenvlcyfglwckßqfgvwkßqgfvlwkßqfgvlwckßqvlwkgfUIαοιαοιαχολωχσωχνωκψρχκψ
+tnaetdr iaoenvlcyfglwckßqfgvwkßqgfvlwkßqfgvlwckßqvlwkgfUIαοιαοιαχολωχσωχνωκψρχκψ
 ρτιεαοσηζϵηζιοεννκεωνιαλωσωκνκψρκγτφγτχκγτεκργτιχνκιωχσιλωσλωχξλξλξωχωχ
 ξχλωωχαοεοιαεοαεοιαεοαεοιαοεσναοεκνρκψγκψφϵιηαααοε"""
 doAssert wrapWords(longlongword) == longlongwordRes