ZWS are added when formats are added, however these are not cleaned up
if the format is changed. Now they will be cleaned up if they only
contain ZWS and no text.
The only time we don't want to restore selection is if the user explicitly
changes it, by clicking/touching a specific cursor point.
Fixes formatting commands in IE11, where the mutation event first between
calling editor.focus() and the focus event actually firing, rather than
after the focus event as in other browsers.
Because focus/blur events are fired synchonously, browsers can get confused if
UI code starts focusing other elements while inside a focus/blur handler, and
end up firing events in the wrong order which can cause infinite loops.
This change ensures we only get a focus/blur event when they really are
happening, and you always get one then the other.
Add an undo configuration.
If the document is larger than the configured threshold, then limit the
number of undo states that can be saved to the configured amount.
Defaults to no limit.
Merged for #200
This protects against malicious HTML being added to the clipboard, and also
removes unwanted content before insertion.
DOMPurify can be found at https://github.com/cure53/DOMPurify
There are certain times when it is necessary to modify the document
programmatically, such as to set attributes, add tooltips, etc. Such
edits should not be observed as inputs. This method allows edits to be
ignored by the editor.
Scrolling depends so much on the integration. Better to allow the cursor
position to be fetched, and then the integration can do the scrolling when it
wants (for example on each "input" event).
* In browsers that support it, we now tell it to copy exactly what was selected
in the DOM, and not to add extra gunk which browsers do to preserve exact
styling if pasted into another document.
* Don't use the clipboard APIs with MS Edge, since it only supports plain text.
If we let it fallback to the browser implementation it will insert HTML.
