<p dir="auto">This not happens outside terminal = using powershell directly.</p>
<h1 dir="auto">Steps to reproduce</h1>
<ol dir="auto">
<li>start type anything</li>
<li>press space</li>
</ol>
<h1 dir="auto">Expected behavior</h1>
<ol dir="auto">
<li>the left space or character on the left of command do not delete</li>
</ol>
<h1 dir="auto">Actual behavior</h1>
<ol dir="auto">
<li>any character on left was deleted and the command characters go to left</li>
</ol>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/671670/65354835-e85e1c00-dbc6-11e9-84c0-83385143c4ae.gif"><img src="https://user-images.githubusercontent.com/671670/65354835-e85e1c00-dbc6-11e9-84c0-83385143c4ae.gif" alt="microsoft-terminal-space-bug" data-animated-image="" style="max-width: 100%;"></a></p>
<h1 dir="auto">Environment</h1>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="Windows build number: 0.3.2171.0
Windows Terminal version (if applicable): 0.3.2171.0

Any other software?"><pre lang="none" class="notranslate"><code class="notranslate">Windows build number: 0.3.2171.0
Windows Terminal version (if applicable): 0.3.2171.0

Any other software?
</code></pre></div>
<h1 dir="auto">Steps to reproduce</h1>
<ol dir="auto">
<li>Open Windows Terminal</li>
<li>Change to any of the Vietnamese input methods and type</li>
</ol>
<h1 dir="auto">Expected behavior</h1>
<ul dir="auto">
<li>Vietnamese texts being entered</li>
</ul>
<h1 dir="auto">Actual behavior</h1>
<ul dir="auto">
<li>For the <a href="https://en.wikipedia.org/wiki/QWERTY#Vietnamese" rel="nofollow">Vietnamese keyboard layout</a>, only the keys 2, 3, 4 work and produce âêô. A few diacritic keys work but produce the separate diacritics instead of combining them into the base letter. The remaining keys failed to work and produce <code class="notranslate">?</code> or the letters with diacritics removed</li>
<li>For the Vietnamese number based and Telex input methods, nothing works</li>
</ul>
<p dir="auto">I've already search several times and the only related issue is <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="476434785" data-permission-text="Title is private" data-url="https://github.com/microsoft/terminal/issues/2213" data-hovercard-type="issue" data-hovercard-url="/microsoft/terminal/issues/2213/hovercard" href="https://github.com/microsoft/terminal/issues/2213">#2213</a> but I don't think it's a duplicate, as Vietnamese uses Latin characters and no pre-edit textboxes are used like CJK languages</p>