The hack was missing at that place.

When check_current_word was FALSE, the GtkTextView was constantly
redrawn. For two reasons:
- because gtk_text_buffer_remove_tag() was called on the current word,
  even if the tag was not present. Which always queued a redraw.
- because of the queue_draw() hack, which was also always called when
  check_current_word is FALSE.

So, for the current word handling, do the queue_draw() hack only if the
tag is removed. And remove the tag only if the tag is present.

Also, queue a redraw on all views, because if two views display the same
region, only one view was redrawn since the scan_region is already empty
for the second view.

Thanks to Sebastian Keller for the bug report.

https://bugzilla.gnome.org/show_bug.cgi?id=768306

Because there was a warning when compiling the docs.

The filenames are now gspellregion.*, not gspell-region.*, so it's easy
to distinguish the foreign code (to count the number of lines for
example).

https://bugzilla.gnome.org/show_bug.cgi?id=766400

To fix the build.

Add a getter function to get the HMODULE.

Reported by and initial patch by Ignacio Casal Quinteiro.

See previous commit.

This reverts commit a9b3e036.

It causes problems with builddir != srcdir when building from git.