fix cycling through completion suggestions ending in non-word character

[Andriamanitra]

The fix is only relevant for certain plugins, but I think this is more correct behavior anyway.

fixes #3649

[matthias314]

I've come across the same issue for the LaTeX plugin I'm working on, and I've come up with the same fix matthias314@f13dc1c. It works well.

[Andriamanitra]

I've come across the same issue for the LaTeX plugin I'm working on, and I've come up with the same fix matthias314@f13dc1c. It works well.

Good to know that this patch is not entirely useless to everyone besides me, and that's funny that you came up with the exact same fix! 😄 My first thought was to separate Autocomplete and CycleAutocomplete and change the default binding for Tab to CycleAutocomplete|Autocomplete|Indent|InsertTab. I still think that would be slightly more elegant solution – but it would mess with users' keybindings so I decided against it.

[matthias314]

I think it's better to modify Autocomplete because this problem already arises when starting autocompletion. For example, for my LaTeX plugin, when I press TAB after \ref{, I want to start autocompletion with all labels defined in the file. If one only changed CycleAutocomplete, then that wouldn't work because of the { character.