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Serialize tab alignment in addition to tab
position. We still accept the old format
and default alignment to left.

Update testserialize and layout tests
for this.

Add right, center, decimal tab alignments and support
them in serialization. They are not implemented yet.

We want to use this without initializing tests.

Explain that tabs really only work with
PANGO_ALIGN_LEFT.

Even when we show ignorables, we still want to
ignore variation selectors and other ignorables
that we don't have nicks for.

Test included.

Fix misplaced glyphs in gravity east

Closes #631

See merge request !524

Without this, we end up with line height being
zero in gravity north or west. The visible symptom
is that wrapped lines are drawn on top of each
other with line-height != 0.

Affected tests have been updated.

Fixes: #631

This was showing up as glyphs placed outside
their logical extents.

Avoid cosmetic ugliness

See merge request !522

Now that we have fonts in git, we can
reliably test this.

When setting variations to "", font descriptions
would add an ugly useless " @" at the end of their
serialization. Avoid that.

Test included.

Make sure glyphinfo is fully initialized

See merge request !523

We can only use the width of the previous char
if we are not at the first char. Found by asan.

We need to copy the scale hack for bitmaps.

The alternative is random test failures, now
that we check all these fields in test-layout.

Hinted metrics fixes

Closes #626

See merge request !518

Rename the serialize errors

See merge request !520

It should work there, but it doesn't.

This makes more sense.

Our new, more precise font checks rely on
data from fontconfig to identify fonts
uniquely. So make sure that we use a custom
fc fontmap, if we have one.

Otherwise editing the output in an editor
is likely to make the data not match anymore,
since most editors will add a final newline.

Update all tests

Add Cantarell, DejaVu Sans and a subset of Noto Color Emoji
 to git, and make test-layout use just those fonts. This
should help with keeping the ci from breaking due to different
system fonts.

Update tests.

Not used anymore.

Another debug api. This function produces a serialization
of a font that is enough to uniquely identify the font.
This is more detailed than what pango_font_describe
creates.

These were produced with the help of
http://gitlab.gnome.org/matthiasc/layout-editor

Json doesn't have comments, so we have to add
an explicit comment value. This will be useful
to describe what test cases are about.

Use the new output serialization in test-layout
to store both the input and output in the same
file.

If requested, serialize lines, runs, and log attrs.
This will let us use the serialization format to
record not just the test inputs, but outputs as
well.

Add some private api for the serializer to get
the font matrix. This is needed to let the serializer
write a unique fingerprint for the font.

This lets us transfer things like base gravity
from layout-editor to pango-view.

Avoid writing out empty attributes or tabs.

Optionally include context information in the
serialization and restore it. This will be useful
for transporting for giving tests complete data
that affects their output.

Some tests included.

This gives us some room to add more things
to these apis, e.g. a way to store not just
the input part of a layout, but also the
output.