fix(sketch): move and copy editable text as a whole source (#715)

Dragging a text outline now moves the whole editable text, and Move/Copy shifts or rotates it as one piece (a copy stays independently editable). Content, font, height and outline identities are kept; a drag is one undo step and Esc restores the start.

crates/ui-egui/src/documents.rs

@@ -80,6 +80,7 @@ fn put_view(app: &mut SolveApp, v: DocView) {
 /// Put `slot` into the app and return what was there.
 fn swap_in(app: &mut SolveApp, slot: DocSlot) -> DocSlot {
     // Whatever was going on in the design leaves with it.
+    crate::sketch_text_move::cancel_drag(app);
     crate::dialogs::cancel(app);
     crate::dim_view::cancel();
     app.tool = None;
@@ -196,6 +197,7 @@ pub fn close(app: &mut SolveApp, i: usize, force: bool) {
     app.docs.closing = None;
     if n <= 1 {
         // The last design: a blank one takes its place.
+        crate::sketch_text_move::cancel_drag(app);
         let rev = app.session.revision;
         crate::dialogs::cancel(app);
         app.tool = None;