Fix #3705: pastes go inside the object in Draw Inside, and Shift+D no longer stops at Draw Behind

The drawing-modes help page
(https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/learn-drawing-basics/drawing-modes-overview.html)
has you draw or paste into the selected object in Draw Inside. It also says
the modes apply to Paste in Place and Paste on All Artboards but not to Paste
in Front or Paste in Back.

Cause: only new art (create::insert_look) read the drawing mode. The paste
commands (edit::paste_clip) always used the insertion parent, so a paste in
Draw Inside landed on the layer above the object, outside the clip.
Double-clicking the object first only isolated the bare path, which didn't
change where the paste went. Separately, view.drawMode {} went from Draw
Behind to Draw Inside whenever one object was selected, then refused it unless
the object was a path, compound path or type. So with one group selected
(such as the clip group Draw Inside makes), Shift+D and the toolbar button
failed every time and stayed in Draw Behind.

Change: the clip-group wrapping moves into create::draw_inside_group, which
new art and pastes now share. In Draw Inside, Paste, Paste in Place and Paste
on All Artboards insert the copies at the top of that group, in the paste's
one undo step, ignoring Paste Remembers Layers. In Draw Behind, Paste in Place
and Paste on All Artboards go just below the selection, as Paste in Back does.
Paste in Front, Paste in Back and pasted artboards keep their placement.
Shift+D goes on to Draw Inside only when it can draw into the selection, and
otherwise back to Draw Normal.

Verification: pasting_in_draw_inside_puts_the_copies_inside_the_object,
paste_in_place_in_draw_behind_goes_behind_the_selection and
shift_d_goes_past_draw_behind_whatever_is_selected all fail without the
change ("Layer" != "Clip Group"; index 3 != 0; the Draw Inside error on a
selected group). cargo xtask ci: all 10 steps passed.

docs/mcp.md

@@ -2961,7 +2961,11 @@ Placement: `edit.paste {center}` centres the objects on a point (the app passes
 by `dx`/`dy` (the Paste Offset preference). With nothing selected, `edit.pasteInFront` / `edit.pasteInBack` put them
 on top / at the bottom of the current layer. `edit.pasteOnAllArtboards` keeps their offset to the artboard they were
 copied from. `layer.pasteRemembersLayers {on?}` (a document option, `document.inspect` → `pasteRemembersLayers`)
-pastes objects back into the layers they came from, by name, making missing ones.
+pastes objects back into the layers they came from, by name, making missing ones. Drawing modes (`view.drawMode`) apply
+too: in Draw Inside, `edit.paste`, `edit.pasteInPlace` and `edit.pasteOnAllArtboards` put the objects inside the
+object drawn into (its clip group, made on the first paste), whatever Paste Remembers Layers says; in Draw Behind,
+`edit.pasteInPlace` and `edit.pasteOnAllArtboards` put them just below the selection. `edit.pasteInFront` and
+`edit.pasteInBack` ignore the drawing mode.
 
 Artboards copy with their art. `artboard.copy {index? | indices?, art?}` puts artboards on the clipboard together
 with the art fully inside each (`index` and `indices` default to the artboards the Artboard tool has selected; `art`