Language definitions having a final semicolon in their globs list
may incorrectly match empty filenames when guessing the language.

Ignore empty globs for matching.

languagemanager: ignore empty globs

See merge request GNOME/gtksourceview!361

Keep on painting the line highlight as long as it's not fully out
of the visible scrolling area.

view: highlight partially visible line

See merge request GNOME/gtksourceview!362

When the `style-scheme` property is unset (i.e. NULL), GtkSourceView was
keeping the previous style (the "classic" one by default) for rendering the
current line, also in the gutters.

Make sure the current line style properties used by the view and gutters
are properly reset after unsetting the style scheme.

view: reset current line style properties after unsetting the style scheme

See merge request GNOME/gtksourceview!363

Change the regex for the generic command parsing in latex.lang.

Fixes: #350.

Fix command parsing in latex.lang

Closes #350

See merge request GNOME/gtksourceview!360

This appears to be significantly smoother than doing it in snapshot. It
appears to originally have been done in snapshot because it was in draw()
previously (and draw_layer later on).

We can't just do this from size_allocate, even thought that does
improve the smoothness. We also need it from snapshot() so that if
something was updated without changing the allocation we still get
updated syntax highlighting.

This has to be done in GtkSourceView just given how things work. But the
GtkSourceMap generally has a lot in view and we don't want to try to do
the ensure_highlight() here beacuse we're too late in the frame clock
cycle for that sort of non-deterministic time.

We already do it from size_allocate() which should be okay given that we
are generally scrolled. The visible area for the main view should pick up
the rest of the changes for us.

Instead of a transform + text for each line number we can use the
GskTextNode with an x offset, y offset + baseline. This can save a lot of
allocations and well as simplify processing.

Fixes #397

This draws below instead of above so that text is more legible. This will
also allow us to premix the slider background color so that we avoid an
RGBA blend in the shader.

Try to generate the real color that would be created by alpha blending and
render that instead as RGB color render node.

This might be a bit against how we're supposed to do it, but since we get
the changes during an allocation of the view it's probably fine.

This avoids deferring things until layer which can simplify what our
frame clock will have to do.

This is useful for correlating to dropped frames.

This reverts commit f6f78ff8.

This is causing portions of the map to not get updated until the
main view scrolls them near visible.

Bummer because it is not great to do these changes here.