News in 3.99.4
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* The API of the GtkSourceView::move-lines keybinding signal has been
  simplified: the copy parameter has been removed; and the count parameter has
  been replaced by the down boolean.
* Force visual word movements for RTL text with Ctrl+left/right.
* Improvements to the Visual Studio builds and add support for Visual Studio
  2017.
* Improvements to the syntax highlighting of: Rust and LaTeX.
* Add mimetype to python3.lang.
* Misc bug fixes.
* Various other small improvements.
* Translation updates.