Color: assigned profiles follow the document in front

The profiles Edit > Assign Profile gives a document stayed the active
color settings after another document came to the front, so a new,
opened or switched-to document drew and converted its colors through the
previous document's profile, and closing the last document left it in
use.

The session now puts the front document's profiles in use (the working
spaces where it has none, or no document is open) after a new or opened
document, a tab switch, a close, File > Revert, every command including
each batch step and Undo or Redo of Assign Profile, a failed batch or
plug-in call, a script's rollback and slice boundaries, a canceled
preview, undo group or undo scope, and for each document Export All Open
and the update of placed documents work in. The active settings are
rebuilt, and the documents redrawn, only when they change.

crates/engine/src/script/mod.rs

@@ -672,6 +672,7 @@ impl Savepoint {
         s.pending_paint = self.pending_paint;
         self.choices.put(s);
         s.journal.truncate(self.journal);
+        s.sync_front_profiles();
         exact
     }
 }
@@ -2199,6 +2200,9 @@ fn failure_text(report: &Value) -> String {
 fn run_slice(s: &mut Session, job: &mut Job) -> std::result::Result<std::result::Result<Progress, RunError>, String> {
     let depth = std::mem::replace(&mut s.depth, 0);
     job.world.swap(s);
+    // The run's front document draws and converts through its own profiles, and the interface's
+    // again after the slice.
+    s.sync_front_profiles();
     s.script_in_run = true;
     let cell = job.host.session.clone();
     std::mem::swap(s, &mut *cell.borrow_mut());
@@ -2221,6 +2225,7 @@ fn run_slice(s: &mut Session, job: &mut Job) -> std::result::Result<std::result:
     s.script_in_run = false;
     job.world.swap(s);
     s.depth = depth;
+    s.sync_front_profiles();
     r
 }