News in 3.19.1
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* New class: GtkSourceTag with a draw-spaces property
* Drop build dependency on intltool, use upstream gettext and ITS Tool instead
* Completion windows: don't add space for scrollbars
* Do not show undo/redo in context menu if undo/redo is disabled
* Bracket matching: several bug fixes, unit tests written, code simplified
* Other small code improvements
* Translation updates