1509641 - Increase the granularity of the undo stack

Status: UNCONFIRMED

(Core :: DOM: Editor, defect, P5)

Description

[Daniel Beardsmore]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0

Steps to reproduce:

Type a large amount of text, and then press Ctrl+Z.


Actual results:

All your text is removed.


Expected results:

The undo stack has too few checkpoints. Pressing Ctrl+Z will undo too much typing. The exact points at which undo should set a checkpoint are a matter of debate, but examples include:

• A pause in typing of some number of seconds
• Starting a new numbered/bulleted list entry in HTML editing mode (this is what Word and Outlook do when they are in a good mood)
• Starting a new line or paragraph with the enter key
• A new sentence, with suitable heuristics (depends on language)
• Word boundaries, with suitable heuristics (this is what Pidgin does in chat messages — Undo removes words one by one, very useful)
• Some random number of letters or seconds (this is what Outlook and Word do)
• Message autosave
• Message manual save (per Outlook)