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<title>how-to-fix-neovim-nerdtree-rendering-issue</title>
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<h2 id="toc-title">Contents</h2>
<ul>
<li><a href="#the-problem" target="_self">The Problem</a></li>
<li><a href="#the-attempt" target="_self">The Attempt</a></li>
<li><a href="#the-actual-solution" target="_self">The Actual Solution</a></li>
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<p>I really like neovim since <a href="https://github.com/neoclide/coc.nvim">COC</a> is integrated with
it to work nicely. Plus, I like the defaults and the fact there's a lot
of active development on extensions. I didn't use it for a long time
because I <em>needed</em> NerdTree but every time I'd scroll the window,
I'd get a mess.</p>
<h2 id="the-problem">The Problem</h2>
<p><img src="/static/media/mess.gif"/></p>
<p>Now, yes, I know I'm a heretic for using the arrow keys and not just
jumping around, but I thought it was weird I didn't see this issue
anywhere else. Also, vim doesn't have this problem.</p>
<p><img src="/static/media/nomess-vim.gif"/></p>
<p>It's also not because of my meme tmux setup, the same issue happens
in terminator, which I happened to have installed.</p>
<p><img src="/static/media/mess-terminator.gif"/></p>
<h2 id="the-attempt">The Attempt</h2>
<p>There's a better way to do this, but I first figured just triggering
a redraw on scroll would do the trick. You can do so by adding the
following line to your init.vim file:</p>
<pre class="vimscript"><code>au WinScrolled * redraw!</code></pre>
<p>As it turns out, the "WinScrolled" event <em>only</em> exists in
neovim, so this command won't work in plain vim (see
<code>:help autocmd-events</code> for the list of events in each
program).</p>
<h2 id="the-actual-solution">The Actual Solution</h2>
<p>After installing COC and running a healthcheck, I realized that my
TERM variable was set to 'xterm'. I'm not sure if I did that
intentionally to run something or if it's just a legacy thing I left in
from Debian's default bashrc, but all I had to do was change it:</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode bash"><code class="sourceCode bash"><span id="cb2-1"><a aria-hidden="true" href="#cb2-1" tabindex="-1"></a><span class="bu">export</span> <span class="va">TERM</span><span class="op">=</span><span class="st">'tmux256-color'</span></span></code></pre></div>
<p><img src="/static/media/fixed.gif"/></p>
<p>No more hacky autocommands!</p>
<p>If I had the foresight to test the issue in xterm first, I probably
would have seen it right away....</p>
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