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Centering the icon is done by hiding the alignment in which the label
would otherwise be presented. The alignment wastes space even if the
label is empty or hidden.

Just like the rest of ThunarThumbnailer, this code is somewhat scary.
ThunarThumbnailer now queues individual thumbnail request in a wait
queue which is triggered at most every 100ms. All requests made in this
time slot are grouped and sent out as *one* request.

For each time slot, the local optimization is 3+n D-Bus messages (1
request, 1 started signal, 1 finished signal and n ready signals) as
compared to 4*n messages we had before (1 request and 1 started,
finished and ready signal for each individual file).

Of course this calculation is naive. In theory our users scroll up and
down like crazy, sometimes slower, sometimes faster, everyeone using
different Thunar window and icon sizes.

As a result the grouped requests are sometimes very small and sometimes
very large. It's worth noting that this optimization performs better,
the more files are visible in the window and the faster a user scrolls
(as this means that more files are made visible within 100ms and thus,
the size of group requests grows). So I guess we're good.

File system is also included in the placeholder as it is supposed to
appear between trash and network for consistency reasons. However, the
file system action is always added to the action group as it will of
course always be displayed.

Otherwise use it's display name in order to be consistent with the
translations of GVfs (or whatever trash implementation is being used).

With this commit, the trash icon is only displayed when the trash:// URI
scheme is supported by GIO. It also adds a network icon if network:// is
supported. Items have been re-arranged a bit. The order now is: home,
desktop, trash, file system, network.

This function checks whether an URI scheme is supported on the system or
not. It will be used by Thunar to find out whether to show/hide
important system paths like trash:// and network:// in the side pane and
in the go to menu.

We probably don't want to set the executable flag for files if we don't
know their UNIX mode. Using 0666 for files prevents Thunar from trying
to execute those files. We still need 0777 for directories though
because only with the execute bit, one can browse a directory.

This helps getting rid of a lot of unnecessary emblems (like for the
trash icon in the side pane).

With GIO, the size of the trash:/// directory no longer corresponds to
whether the trash is empty or not. Instead, we have to use the
G_FILE_ATTRIBUTE_TRASH_ITEM_COUNT attribute. This commit adds a new
method thunar_file_get_item_count() which is used the shortcuts pane and
the tree view to make the empty trash action sensitive or insensitive.

Also remove a few redundant g_file_info_has_attribute() checks.

This restores the old pre-GIO behavior. Remote file systems and schemes
like trash:// don't support trashing, thus we need to delete their files
permanently.

This didn't work before for several reasons: the trash attribute
namespace was not part of THUNARX_FILE_INFO_NAMESPACE and Thunar tried
to read trash::orig-file but it's actually trash::orig-path. Last but
not least, this one is not a normal but a byte string attribute.

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Hope this is done the right way. At least it makes Thunar compile again.

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Pass G_FILE_QUERY_INFO_NONE to thunar_io_scan_directory() instead of
G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS, otherwise that function is not able
to identify the type of the GFile as a G_FILE_TYPE_DIRECTORY.

Most of them are the new tooltip api in plugins and
GtkEntry -> GtkEditable functions.

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Also refactor the wallpaper plugin code a bit, so it
matches the thunar coding style.