Improvement to inline editing of long text

[sniemetz]

Hi Oli,

First off - many thanks for this library. Amazing attention to detail.

In my use case, I have rows with longText columns, some of which can contain 1MB or more of text.
To enable editing I used the textarea editor but the UX is poor with a lot of text.

I'd like, for the textarea editor to

• pop out the textarea (I manually does this by hooking into the cellEditing event and modifying CSS)
• don't close the text area on blur (eg if I use Ctrl-F to search in the textarea it closes)
• cancel and save buttons (since we're not auto-saving on blur)

I've used the cellEditing event with a timeout of 100ms (because the textarea is not initialized right when the event fires).
Then I use the cellEdited and cellEditCancelled events to revert the CSS changes.
The CSS I use make the textarea position:fixed to pop it out of the table, with a fixed height/width

Arguably you could use a similar approach for "input" editor - showing a longer field for example. Maybe it makes sense to implement the input editor as actual input rather than making the div editable?