Fix #1881: a Ctrl/Cmd drag while typing keeps what was typed

With the Type tool editing, a press with Ctrl (Cmd on the Mac) lends the
Selection tool for the drag. Its drag joined the open typing session, so its
preview started from the document before the typing: the type moved or
scaled and lost what had just been typed. The typing is now kept as its own
undo step before the lent tool takes the press, as Undo already does, and
typing goes on after the drag.

crates/engine/src/cmd/mod.rs

@@ -457,6 +457,7 @@ pub(crate) fn unique_name(base: &str, taken: impl Fn(&str) -> bool) -> String {
     (2..).map(|i| format!("{base} {i}")).find(|n| !taken(n)).unwrap_or_else(|| base.to_string())
 }
 
+pub(crate) use edit::{settle_interaction, typing_in_progress};
 pub(crate) use vectorcraft_doc::range::parse_range;
 
 /// A date param in Unix seconds that defaults to the clock: `None` when absent (now, see