patch 8.0.0126
Problem: Display problem with 'foldcolumn' and a wide character.
(esiegerman)
Solution: Don't use "extra" but an allocated buffer. (Christian Brabandt,
closes #1310)
diff --git a/src/testdir/test_display.vim b/src/testdir/test_display.vim
new file mode 100644
index 0000000..ba7b7d7
--- /dev/null
+++ b/src/testdir/test_display.vim
@@ -0,0 +1,37 @@
+" Test for displaying stuff
+if !has('gui_running') && has('unix')
+ set term=ansi
+endif
+
+function! s:screenline(lnum, nr) abort
+ let line = []
+ for j in range(a:nr)
+ for c in range(1, winwidth(0))
+ call add(line, nr2char(screenchar(a:lnum+j, c)))
+ endfor
+ call add(line, "\n")
+ endfor
+ return join(line, '')
+endfunction
+
+function! Test_display_foldcolumn()
+ new
+ vnew
+ vert resize 25
+
+ 1put='e more noise blah blah‚ more stuff here'
+
+ let expect = "e more noise blah blah<82\n> more stuff here \n"
+
+ call cursor(2, 1)
+ norm! zt
+ redraw!
+ call assert_equal(expect, s:screenline(1,2))
+ set fdc=2
+ redraw!
+ let expect = " e more noise blah blah<\n 82> more stuff here \n"
+ call assert_equal(expect, s:screenline(1,2))
+
+ quit!
+ quit!
+endfunction