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Don't create them until necessary. We can also just store an adapter
which won't hold any objects for a given extension as a negative hit
for a given language.

We can also use const/interned strings for the key and direct pointer
comparison.

This just helps protect against multiple calls to set the context or a
NULL value for the context.

It was possible previously that we could notify multiple times for the same
IdeContext. This stashes a pointer (only for comparison) in quark data like
we do with our handler. It then only notifies when that has changed.

Additionally, we move to using the Quark API instead of the string-based
API.

We need to release the variants during finalize.

This detects the XDG_CURRENT_DESKTOP and logs it along with our gtk version
to simplify tracking down issues. Running with -v will display this
information.

Builder relies on a properly configured desktop session with the DBus
session address propagated in the standard manner.

This simplifies handlers by ensuring we emit ::log on a per-line basis.

This also includes a test for the condition.

Fix grammar (“entry disabling”, “dir”), use Unicode apostrophes,
and move comments directly above the strings so they get picked up
by gettext.

This reverts commit 0d97531c.

To better handle the out and err streams and avoid a leak or
double free on validation error, we validate it manually.

If we race against some other action changing the selected item, we might
not have a valid selection in the callbacks. So instead, we'll take a
reference to the tree node as GData to the popover (and then read that
back instead of reading the tree selection).

We can also now build the plugin as an embedded one