<p></p>
<p>Got it!!! When creating the XPM image of the squiggle to underline the spelling error Scintilla allocates a vector to hold it whose size is <code>width*height*4</code> and that doesn't allocate if the width or height is zero, so any index operation will likely crash.</p>
<p>Unfortunately the backtrace <a class="user-mention" data-hovercard-type="user" data-hovercard-url="/users/hroncok/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/hroncok">@hroncok</a> posted has too many values optimised out/not printed to know where it gets that zero from, and why it only applies if the variant is applied to a character without variants and only on <a class="user-mention" data-hovercard-type="user" data-hovercard-url="/users/hroncok/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/hroncok">@hroncok</a>'s system</p>

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