v0.20.0

• Action required if you edit an issue with alt+e. The key, the handoff
  to your $EDITOR and the editor.command config key are gone. Edit the
  issue with alt+u: the new issue editor also holds the description. A
  config that sets editor.command, or that binds the edit_issue action,
  still starts, with a startup warning for each: delete the entry.
• Action required if your config binds ctrl+s in the shell context or
  alt+d in the detail context. ctrl+s now saves in the issue editor and
  alt+d deletes a comment. A config that already binds one of them to
  another action of that context fails startup and --check-config, for
  example with key "ctrl+s" conflicts between actions ... in shell context.
  Rebind one of the two; the new actions are save_edit in shell and
  delete_comment in detail.
• Changed: one issue editor replaces the dialogs. alt+n, alt+u,
  delete and alt+a now open a full screen and no longer a box over the
  screen. It has a row for the title, the status, the type, the priority, the
  assignee and the labels, and the description below them as text of many
  lines. tab, shift+tab, up and down move between the fields, and in
  the description up and down move the cursor until its first or its last
  line. left and right step the status, the type and the priority through
  the values of the store. ctrl+s or the Save button saves, and esc or
  Cancel leaves without a question. Only the fields you changed are written.
  delete opens the editor with the status on closed and the cursor on the
  close reason, and writes nothing until you save. For a comment the editor
  has the text alone. The dialogs for the status and for the priority alone
  are gone.
  docs/user-guide/key-bindings.md
  has all the keys.
• Fixed: the dialogs to create and to update an issue did not fit a terminal
  of fewer than about 39 rows. On a terminal of 30 rows the labels, the
  description and the buttons were not drawn. The issue editor fits a terminal
  of 80 columns and 24 rows.
• Changed: a refused save keeps the editor open. When the store refuses a
  save, for example for an empty title or a description that a store hook
  rejects, the editor stays open with what you typed, and the refusal stands
  in red above the form. Correct it and save again.
• Added: edit and delete a comment. On the detail page right from the
  content moves to the comments, and up and down select one. enter edits
  the selected comment in the issue editor, and alt+d deletes it after a yes
  in a dialog. An edited comment gets a new time and your name, so it moves to
  the top. A rule now stands between two comments.
• Added: buttons on the detail page. edit stands at the right end of the
  line with the ID of the issue, add on the Comments heading, and edit
  and delete on the selected comment. Each shows the key that does the same,
  and a click presses it.
• Changed: the Metadata pane of the detail page only shows the fields. It
  takes no focus, no key and no click: left and right move between the
  dependencies, the content and the comments, and enter on the status or the
  priority no longer opens a dialog. The pane does not scroll. When the screen
  is too short for all its rows, as on a terminal of 80 columns and 24 rows,
  it ends on … (N more). It is 2 columns narrower, and the content has those
  columns.
• Changed: the detail page does not draw the line of the view tabs. tab and
  shift+tab still leave it for a tab.