feat: print uncommitted patches

The newly uncommitted patches are printed using the conventions for applied
patches. Without this printing, the user only output provided to the user
is the topmost patch, which may or may not be one of the newly uncommitted
patches.

src/stack/transaction/mod.rs

@@ -743,6 +743,7 @@ impl<'repo> StackTransaction<'repo> {
             );
             new_applied.push(patchname.clone());
         }
+        self.ui.print_uncommitted(new_applied.as_ref())?;
         new_applied.append(&mut self.applied);
         self.applied = new_applied;
         Ok(())

src/stack/transaction/ui.rs

@@ -75,6 +75,24 @@ impl TransactionUserInterface {
         Ok(())
     }
 
+    pub(super) fn print_uncommitted(&mut self, uncommitted: &[PatchName]) -> Result<()> {
+        if !uncommitted.is_empty() {
+            let mut output = self.output.borrow_mut();
+            let mut color_spec = termcolor::ColorSpec::new();
+            output.set_color(color_spec.set_fg(Some(termcolor::Color::Green)))?;
+            write!(output, "+ ")?;
+            output.set_color(color_spec.set_fg(None))?;
+            let first = uncommitted.first().unwrap();
+            if uncommitted.len() == 1 {
+                writeln!(output, "{first}")?;
+            } else {
+                let last = uncommitted.last().unwrap();
+                writeln!(output, "{first}..{last}")?;
+            }
+        }
+        Ok(())
+    }
+
     pub(super) fn print_deleted(&self, deleted: &[PatchName]) -> Result<()> {
         if !deleted.is_empty() {
             let mut output = self.output.borrow_mut();