When selecting files, the menu is lazy update to reduce
the ammount of calls for the possible applications.

Updates are force when the menu is shown or an action is
executed.

Pinters are not identical, so check the desktop-ids.

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This should be smarter, but its a start. Especially
thunar_file_list_get_applications is very slow here
because of g_app_info_get_all_for_type.

This loads massive ammounts of data when going through
images and slows down systems a lot.

This avoids a lot of statusbar updates when scrolling
with the selection.

pspecs are already freed in finalize.

Those are defined these days.

This has some benefit when the folder is already loaded
in another view.

GIO has a bug that most icon-names start with "(null)",
do a quick check to skip those.

The icon name is never null, so this pass is useless.

Adapt thunar_io_scan_directory to optionally return
ThunarFile's instea of GFile and create ThunarFiles
later for some io jobs.

This trick is that we can directly use the enumerator
to scan all the directory info and use that for the
new ThunarFiles, this saves querying a file twice
resulting in much faster directory loading.

This storage type is much more suitable for storing
the large number of files. Biggest improvement is
the number of times the sort function is called, in
large directories this is ~5% of the calls during adding
files.

Code is easier to understand this way.

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Only peek the GIcon names and less string checking.

Checking for home was too expensive. Also reorder the
checks to we do less checking for is_root.

The ThunarFile was never loaded because it was not created,
so check if the new files belong to this directory,
else do no try to reload later.

Was easy to reproduce to dnd into a folder.