From 76b5c9283da30f90acadda0da3b77534909c88d7 Mon Sep 17 00:00:00 2001
From: w0rp <devw0rp@gmail.com>
Date: Fri, 2 Jun 2017 19:02:48 +0100
Subject: [PATCH] #574 Do not restore items with no columns for highlights from
 hidden buffers

---
 autoload/ale/highlight.vim          | 6 +++++-
 test/test_highlight_placement.vader | 2 ++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/autoload/ale/highlight.vim b/autoload/ale/highlight.vim
index f3a479e3..5e4cbdb0 100644
--- a/autoload/ale/highlight.vim
+++ b/autoload/ale/highlight.vim
@@ -109,7 +109,11 @@ function! ale#highlight#BufferHidden(buffer) abort
             endif
         endfor
 
-        let s:buffer_restore_map[a:buffer] = l:loclist
+        let s:buffer_restore_map[a:buffer] = filter(
+        \   copy(l:loclist),
+        \   'v:val.bufnr == a:buffer && v:val.col > 0'
+        \)
+
         call clearmatches()
     endif
 endfunction
diff --git a/test/test_highlight_placement.vader b/test/test_highlight_placement.vader
index 25c98784..b5816852 100644
--- a/test/test_highlight_placement.vader
+++ b/test/test_highlight_placement.vader
@@ -96,8 +96,10 @@ Execute(Highlights set by ALE should be removed when buffer cleanup is done):
 
 Execute(Highlights should be cleared when buffers are hidden):
   call ale#engine#InitBufferInfo(bufnr('%'))
+  " The second item should be ignored, as it has no column infomration.
   let g:ale_buffer_info[bufnr('%')].loclist =  [
   \ {'bufnr': bufnr('%'), 'type': 'E', 'lnum': 3, 'col': 2},
+  \ {'bufnr': bufnr('%'), 'type': 'E', 'lnum': 4, 'col': 0},
   \]
   call ale#highlight#SetHighlights(
   \ bufnr('%'),