<p>Actually I tested SciTE, which is kind enough to open the file without problem, and simply showing plain bytes for the invalid ones, making line 1738 (last one) look like this:<br>
<a href="https://cloud.githubusercontent.com/assets/793526/18629100/cbc62c9a-7e63-11e6-867e-cc052e495886.png" target="_blank"><img src="https://cloud.githubusercontent.com/assets/793526/18629100/cbc62c9a-7e63-11e6-867e-cc052e495886.png" alt="l1738" style="max-width:100%;"></a></p>

<p>It's pretty messy but fair enough.  However, we probably won't do that, because being able to have a fixed encoding in the data we load means that we have to handle encoding conversion in a single place, instead of everywhere something touches the data -- and there are a lot of code that does that, it's and editor after all.<br>
Also, as UTF-8 can represent virtually any textual data (anything inside Unicode), it would only help with invalid input (like here) or binary data (which probably would better be handled with a hex filter).  So I'm afraid it won't happen.<br>
If someone has a nice solution though, I'd love to be proven wrong.</p>

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