[Github-comments] [geany/geany-plugins] Splitting a snowman in half crashes Geany with Spell Check (inserting a space before Unicode VARIATION SELECTOR-16) (#1041)

[Miro Hrončok]

Hello. I run geany 1.37.1 on Fedora 33 and Geany crashes when I try to put a space between an emoji and Unicode VARIATION SELECTOR-16.

Steps to reproduce:

1. Enable the Spell Check plugin and enable spell checking. I use en_US in case it matters.
2. Insert an emoji with VARIATION SELECTOR-16, e.g. ☃️ (select the entire line form the *source* of this comment or [from here](https://blog.tomayac.com/2019/12/12/same-same-but-different-unicode-variation-selector-16/#the-unicode-variation-selector-16)).
3. Move the cursor between the two characters:
   ![_](https://user-images.githubusercontent.com/2401856/100599500-673d0180-3300-11eb-9cc8-d170ba6ea0d9.png)
4. Type "space" (or any other character it seems).
5. Geany crashes (aborts).

```
/usr/include/c++/10/bits/stl_vector.h:1063: std::vector<_Tp, _Alloc>::const_reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) const [with _Tp = unsigned char; _Alloc = std::allocator<unsigned char>; std::vector<_Tp, _Alloc>::const_reference = const unsigned char&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]: Assertion '__builtin_expect(__n < this->size(), true)' failed.
```


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