Paragraph dispappears while removing words via Ctrl+Backspace and undo'ing

[antonlabunets]

Paragraph worth of data disappears after 3 Ctrl + Backspace and 2 Ctrl + Z to undo the word removal.

Steps for Reproduction

1. Visit http://quilljs.com/playground
2. Copy the text non-column text blocks from http://lipsum.com/ [START with the header "The standard Lorem Ipsum passage, used since the 1500s" and END at "to avoid worse pains." before the help@limpsum.com block]
3. Use Ctrl + Backspace to remove 3 words ("Unable to get property 'mutations' of undefined or null reference" shows up in the console at blot.update(blot.domNode[Registry.DATA_KEY].mutations || []);). Then Ctrl + Z to undo 2 times (See "Unable to get property 'length' of undefined or null reference" now in the console on keydown var curContext = { range...)

Expected behavior: Words are re-added back one by one until we get back to full paragraph

Actual behavior: After 2nd redo, the whole paragraph disappears and "Cannot read property 'mutations' of undefined" throws at

Platforms: IE 11.0.9600.18450 windows 10, 8 or 2012 R2

Include browser, operating system and respective versions

Version: We see it on 1.0 final internally and 1.0.6 from playground

Run Quill.version to find out

[anindara]

This might help: Looks like when trying to update the underlying TextBlot with the mutations in its domNode, we are unable to find the Registry.DATA_KEY in this blot's domNode. Enclosed

Referenced Parchment issue has more details

[jhchen]

Fixed in Parchment 1.0.8.