Merge #11034 from zwegner/precedes

Fix "precedes" listchar behavior in wrap mode

3 files changed, 60 insertions, 6 deletions

diff --git a/src/nvim/screen.c b/src/nvim/screen.c
index f4aa10ecf5..a866901b78 100644
--- a/src/nvim/screen.c
+++ b/src/nvim/screen.c
@@ -3756,14 +3756,12 @@ win_line (
       char_attr = hl_combine_attr(char_attr, extra_attr);
     }
 
-    /*
-     * Handle the case where we are in column 0 but not on the first
-     * character of the line and the user wants us to show us a
-     * special character (via 'listchars' option "precedes:<char>".
-     */
+    // Handle the case where we are in column 0 but not on the first
+    // character of the line and the user wants us to show us a
+    // special character (via 'listchars' option "precedes:<char>".
     if (lcs_prec_todo != NUL
         && wp->w_p_list
-        && (wp->w_p_wrap ? wp->w_skipcol > 0 : wp->w_leftcol > 0)
+        && (wp->w_p_wrap ? (wp->w_skipcol > 0 && row == 0) : wp->w_leftcol > 0)
         && filler_todo <= 0
         && draw_state > WL_NR
         && c != NUL) {
diff --git a/src/nvim/testdir/test_display.vim b/src/nvim/testdir/test_display.vim
index 5feb59eef1..66c13ded82 100644
--- a/src/nvim/testdir/test_display.vim
+++ b/src/nvim/testdir/test_display.vim
@@ -69,3 +69,58 @@ func! Test_display_foldtext_mbyte()
   set foldtext& fillchars& foldmethod& fdc&
   bw!
 endfunc
+
+func Test_display_listchars_precedes()
+  call NewWindow(10, 10)
+  " Need a physical line that wraps over the complete
+  " window size
+  call append(0, repeat('aaa aaa aa ', 10))
+  call append(1, repeat(['bbb bbb bbb bbb'], 2))
+  " remove blank trailing line
+  $d
+  set list nowrap
+  call cursor(1, 1)
+  " move to end of line and scroll 2 characters back
+  norm! $2zh
+  let lines=ScreenLines([1,4], winwidth(0)+1)
+  let expect = [
+        \ " aaa aa $ |",
+        \ "$         |",
+        \ "$         |",
+        \ "~         |",
+        \ ]
+  call assert_equal(expect, lines)
+  set list listchars+=precedes:< nowrap
+  call cursor(1, 1)
+  " move to end of line and scroll 2 characters back
+  norm! $2zh
+  let lines = ScreenLines([1,4], winwidth(0)+1)
+  let expect = [
+        \ "<aaa aa $ |",
+        \ "<         |",
+        \ "<         |",
+        \ "~         |",
+        \ ]
+  call assert_equal(expect, lines)
+  set wrap
+  call cursor(1, 1)
+  " the complete line should be displayed in the window
+  norm! $
+
+  let lines = ScreenLines([1,10], winwidth(0)+1)
+  let expect = [
+        \ "<aaa aaa a|",
+        \ "a aaa aaa |",
+        \ "aa aaa aaa|",
+        \ " aa aaa aa|",
+        \ "a aa aaa a|",
+        \ "aa aa aaa |",
+        \ "aaa aa aaa|",
+        \ " aaa aa aa|",
+        \ "a aaa aa a|",
+        \ "aa aaa aa |",
+        \ ]
+  call assert_equal(expect, lines)
+  set list& listchars& wrap&
+  bw!
+endfunc
diff --git a/src/nvim/testdir/view_util.vim b/src/nvim/testdir/view_util.vim
index 29ea073f97..520f65c1e7 100644
--- a/src/nvim/testdir/view_util.vim
+++ b/src/nvim/testdir/view_util.vim
@@ -42,6 +42,7 @@ endfunction
 function! NewWindow(height, width) abort
   exe a:height . 'new'
   exe a:width . 'vsp'
+  set winfixwidth winfixheight
   redraw!
 endfunction