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It's just weird not to.

When switching on single-window mode, put docks in the image window
depending on what side of the window they originally had.

When moving out GimpDock:s from a GimpDockColumns into a new
GimpDockWindow when switching off single-window mode, try to preserve
the size of the original GimpDockColumns.

It's enough to setup gimp_toolbox_drop_uri_list() on the vbox.

to set a frame's sensitivity instead of a signal callback. Also
improve tool options.

Distribute dock windows better when switching off single-window
mode. First, create one dock window per side of the image window
rather than one dock window per dock. Secondly, move the left docks to
the upper left corner of the screen, and the right docks to the upper
right corner.

The special case isn't pretty, but the current design can't handle it
nicely. This is not the first special case for the toolbox.

Pass gimp in gui_restore_after_callback() to
gui_restore_after_callback() so we can update properly.

The Tile Glass plug-in is moved from Lens And Shadow to Artistic
where it really belongs.

The Apply Lens filter is moved from Light And Shadow to Distorts
group where it really belongs.

Turn the "Preview type" combo into a simple "Show image" toggle and
enable the "No guides" choice in the guides combo. Remove unused enum
GimpTransformPreviewType. This way the preview and guide/grid controls
are strictly separate and much less confusing.