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This fixes an issue when the file to be edited is not currently open.

Related to #673

If we match 'E' with 'e', that should have a higher cost than 'e' with 'e'.

This ensures that we match 'E' before 'e' in 'Endianness' if the input
character is 'e'. Otherwise, 'end' won't match and that is not the
expected behavior.

This just takes the earliest of 'E' or 'e' as the match for any character
that has a toupper() variant, at the cost of running additional matches.

This code does need to stay fast, but it seemed fast enough in testing.

Fixes #673

Fixes #685

This can be non-widgets too, like a GtkSizeGroup.

This tries to locate some information about the catalogs from the build
runtime and installation prefix. It's somewhat problematic in that
accessing libraries and what not is not necessarily possible. But we can
start here and see how things work out.

It is fine to open an empty .ui file, since we will write the proper
<interface/> element and such when saving it back to disk.

Fixes #682

These are set automatically, according to

  https://github.com/flathub/org.gnome.Builder/pull/6/files

When guessing the language from GtkSourceView, we can remove the trailing
.in so that we are more likely to get the proper language type. This is
useful because rarely are people simply caring about the template expansion
and more interested in the underlying language syntax.

Fixes #681

I wanted to avoid this originally, since .ui files can also be used with
other systems such as Qt, but we are a GNOME focused IDE and there is very
little we could ever do to support Qt, so just mark the .ui glob as being
a gtk-builder file.

This simplifies our signal tracking, and allows us a convenient place to
start doing tracking of more GladeProject signal editing.

When saving the designer view, we want to reload the editor source for the
user so that they don't need to get a "modified on disk" warning. This
requires a bit more manual state tracking, but it's worth it.

This allows us to reload a glade project in what seems like "in-place".
Supporting this will allow us to track changes from the editor immediately.

This makes the visibility more similar to what we do with the symbol
popover, which is the closest metaphor here.

These are slightly more useful than the previous tooltip text.

This adds actions for undo/redo and wires up shortcuts to them. It also
adds menu entries for the document menu.

Glade doesn't generate 2x icons, so we probably want to make something new
for these values.