Make the modal choice between "Edit This Event" and "Edit Future Events" more clear

Summary:
Fixes T11909. Ref T11816. Instead of offering a dropdown with choices between "Edit/Cancel/Reinstate This Event" and "Edit/Cancel/Reinstate Future Events", make the choice more explicit.

This dialog ends up pretty wordy but this edit is rare, so I think that's alright.

Test Plan: {F2046863}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11816, T11909

Differential Revision: https://secure.phabricator.com/D16956

src/applications/calendar/controller/PhabricatorCalendarEventCancelController.php

@@ -138,18 +138,54 @@ final class PhabricatorCalendarEventCancelController
       ->addSubmitButton($submit);
 
     if ($show_control) {
+      $start_time = phutil_tag(
+        'strong',
+        array(),
+        phabricator_datetime($event->getStartDateTimeEpoch(), $viewer));
+
+      if ($is_cancelled) {
+        $this_name = pht('Reinstate Only This Event');
+        $this_caption = pht(
+          'Reinstate only the event which occurs on %s.',
+          $start_time);
+
+        $future_name = pht('Reinstate This And All Later Events');
+        $future_caption = pht(
+          'Reinstate this event and all events in the series which occur '.
+          'on or after %s.',
+          $start_time);
+      } else {
+        $this_name = pht('Cancel Only This Event');
+        $this_caption = pht(
+          'Cancel only the event which occurs on %s.',
+          $start_time);
+
+        $future_name = pht('Cancel This And All Later Events');
+        $future_caption = pht(
+          'Cancel this event and all events in the series which occur '.
+          'on or after %s.',
+          $start_time);
+      }
+
+
       $form = id(new AphrontFormView())
         ->setViewer($viewer)
         ->appendControl(
-          id(new AphrontFormSelectControl())
-            ->setLabel(pht('Cancel Events'))
+          id(new AphrontFormRadioButtonControl())
             ->setName('mode')
-            ->setOptions(
-              array(
-                'this' => pht('Only This Event'),
-                'future' => pht('All Future Events'),
-              )));
-      $dialog->appendForm($form);
+            ->setValue(PhabricatorCalendarEventEditEngine::MODE_THIS)
+            ->addButton(
+              PhabricatorCalendarEventEditEngine::MODE_THIS,
+              $this_name,
+              $this_caption)
+            ->addButton(
+              PhabricatorCalendarEventEditEngine::MODE_FUTURE,
+              $future_name,
+              $future_caption));
+
+      $dialog
+        ->setWidth(AphrontDialogView::WIDTH_FORM)
+        ->appendForm($form);
     }
 
     return $dialog;

src/applications/calendar/controller/PhabricatorCalendarEventEditController.php

@@ -46,22 +46,34 @@ final class PhabricatorCalendarEventEditController
         }
 
         if (!$mode) {
+          $start_time = phutil_tag(
+            'strong',
+            array(),
+            phabricator_datetime($event->getStartDateTimeEpoch(), $viewer));
+
           $form = id(new AphrontFormView())
             ->setViewer($viewer)
             ->appendControl(
-              id(new AphrontFormSelectControl())
-                ->setLabel(pht('Edit Events'))
+              id(new AphrontFormRadioButtonControl())
                 ->setName('mode')
-                ->setOptions(
-                  array(
-                    PhabricatorCalendarEventEditEngine::MODE_THIS
-                      => pht('Edit Only This Event'),
-                    PhabricatorCalendarEventEditEngine::MODE_FUTURE
-                      => pht('Edit All Future Events'),
-                  )));
-
+                ->setValue(PhabricatorCalendarEventEditEngine::MODE_THIS)
+                ->addButton(
+                  PhabricatorCalendarEventEditEngine::MODE_THIS,
+                  pht('Edit Only This Event'),
+                  pht(
+                    'Edit only the event which occurs at %s.',
+                    $start_time))
+                ->addButton(
+                  PhabricatorCalendarEventEditEngine::MODE_FUTURE,
+                  pht('Edit This And All Later Events'),
+                  pht(
+                    'Edit this event and all events in the series which '.
+                    'occur on or after %s. This will overwrite previous '.
+                    'edits!',
+                    $start_time)));
           return $this->newDialog()
             ->setTitle(pht('Edit Event'))
+            ->setWidth(AphrontDialogView::WIDTH_FORM)
             ->appendParagraph(
               pht(
                 'This event is part of a series. Which events do you '.