- re-order element to be the same as in notebook,
- rename events correctly.
- Add event on savign to show that save is in progress, that get
dismissed on file save
Closes#7569
When a users uses the rename dialog in the text editor, we call
_set_mode_for_model on the returned model. The expected model to be
returned from rename has no value for mimetype, which causes us to pass
`undefined` to `CodeMirror.findModeByMIME`, which returns `undefined`
back. We then try access an attribute of the (undefined) return value,
causing an error.
This now properly checks whether the `mimetype` attribute is set on the
input model.
Prior to this change, setting a document's initial content in the text
editor created a history entry, which meant that hitting CTRL-Z
repeatedly could clear the entire document. This change clears document
history after loading so that repeated CTRL-Z applications return the
document to its state at load time.
Bussonnier Matthias
Min RK
Scott Sanderson
Nicholas Bollweg (Nick)
Thomas Kluyver