Mail · Sorting: a label picker and a snooze menu

LabelPicker puts labels on a message: a field finds them by name,
arrows move and a press or Enter turns one on or off, each row with its
check and its hue. A name no label has can be made into one, and the
field starts over. Its rows are the option rows every list shares;
forms::marked_row leads one with a mark. The cursor shows only while
the field has focus.

SnoozePicker offers later today, tomorrow, this weekend and next week,
each with its day and hour, or a time picked in a dialog. It shares
mail::times with ScheduleSend: the names, the dialog, which now waits
for a time ahead of now, and a rule that a moment comes once, so on a
Sunday tomorrow morning no longer repeats as Monday morning.

src/forms/mod.rs

@@ -85,8 +85,8 @@ pub use multi::MultiSelect;
 pub use number::{NumberInput, ScrubInput};
 pub use options::Choice;
 pub(crate) use options::{
-    OnFlag, OnNumber, OnValue, OnValues, Pick, Run, float, float_height, reveal, revealer, step,
-    surface,
+    OnFlag, OnNumber, OnValue, OnValues, Pick, Run, float, float_height, marked_row, reveal,
+    revealer, step, surface,
 };
 pub use pairs::{FieldArray, KeyValueInput, ListInput};
 pub use path::PathInput;

src/forms/options.rs

@@ -87,6 +87,18 @@ pub(crate) fn option_row(
     highlighted: bool,
     checked: Option<bool>,
     cx: &App,
+) -> Stateful<Div> {
+    marked_row(id, choice, None, highlighted, checked, cx)
+}
+
+/// An option row with `mark`, such as a label's color, before the label.
+pub(crate) fn marked_row(
+    id: impl Into<ElementId>,
+    choice: &Choice,
+    mark: Option<AnyElement>,
+    highlighted: bool,
+    checked: Option<bool>,
+    cx: &App,
 ) -> Stateful<Div> {
     let theme = cx.theme();
     let colors = &theme.colors;
@@ -128,6 +140,7 @@ pub(crate) fn option_row(
         .when_some(choice.icon, |row, icon| {
             row.child(Icon::new(icon).size(IconSize::Sm).color(colors.fg_muted))
         })
+        .children(mark)
         .child(
             div()
                 .flex_1()