Calendar · Editing: an event's editor, its repeats, reminders and open times

EventEditor puts an event's parts in a form: its title, whole days or
hours, where, its color, how it repeats, its reminders and notes. Save
waits for a title and an end after the start and hands on an
EventDraft; Cancel and Delete show when the owner handles them. A new
draft from the owner starts the editor over.

RecurrenceEditor sets a rule after RFC 5545: daily, weekly on its days,
monthly or yearly, every so many, until a day or a count. A line reads
the rule back with the next days it falls on. ReminderPicker keeps
reminders from a fixed list, soonest first, and Add brings the nearest
one not yet set. AvailabilityPicker counts the open slots of each day
and lists the chosen day's, around what is busy, inside working hours
and after now.

FormField filled its column with a percent width, which taffy 0.9
leaves at content width when a block measures the column first and the
width comes out the same: at 280px the editor's fields shrank to their
labels. It now fills with min_w_full, as new roots do; older roots move
over in T44.

AGENTS.md

@@ -141,7 +141,7 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - A row that holds text beside fixed parts lets the text give way: the text takes `flex_1().min_w_0()` and an `Ellipsis`; counts, icons, dates and chevrons take `flex_none`. A label that must stay whole wraps in that block instead, as `forms::Checkbox`'s does.
 - A mark over a text field reads the field at paint time, from a canvas laid over it (`collab::RemoteCursor`): by then `TextInput::bounds_for` holds this frame's layout, and a still page never renders again to catch up.
 - A callback field holds a named `type` alias; clippy's type_complexity rejects `Option<Rc<dyn Fn(..)>>`. A chapter shares one alias per shape.
-- A component that fills its container says `w_full` on its root. As a window's root, or in a flex row, it would shrink to its text's narrowest width.
+- A component that fills its container says `min_w_full` on its root. As a window's root, or in a flex row, an auto width would shrink to its text's narrowest width. A percent width does not stretch in a flex box, and taffy 0.9 lays a flex box out once at unknown width while a block parent measures its content, then keeps that layout when the width comes out the same: its `w_full` children stay at content width (`forms::FormField`). Roots made before T30d still say `w_full`; T44 moves them.
 - A field's `Highlight` sets color, wash, weight, slant and strike per span; measuring and painting share one set of runs, so wrapped heights match.
 - A block editor keeps one undo for the document: text and structure together, as snapshots through `forms::History`; it takes Undo and Redo before its fields do.
 - gpui calls focus listeners only while the window is active. A test that needs focus events activates its window with `window.activate_window()`.
@@ -156,6 +156,7 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - The system time zone comes from `typography::format::system_zone`, which fails loud; jiff's `TimeZone::system()` falls back to UTC in silence.
 - A Select with nothing to pick stays shut: disabled, it shows its placeholder; open, it fails (`media::DeviceSelector` says no device was found).
 - A list opens with its cursor on the current choice: Select on the chosen row, Combobox on its value, MultiSelect on the first one ticked, SelectableList on its first selected row. A selection the owner makes, not the echo of the list's own pick, moves SelectableList's cursor there.
+- An event repeats as RFC 5545 has it: weeks count from the start's own week, and a month or a year without the start's date is passed over (`calendar::Recurrence`).
 - A search step, a tool call or an agent's step says where it stands with `chat::StepState` and draws it with `chat::step_mark`.
 - A flex line whose free space goes to an auto margin loses its gaps in taffy 0.9. A row that parts left and right groups its sides and uses `justify_between`; `ml_auto` is safe only beside a `flex_1` item that leaves no free space.
 - A header that holds a name beside counts and actions wraps: `flex_wrap`, the name `flex_1` with `min_w(label_width)`, the rest one `flex_none` group that drops below.