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b3b969af35
Chrome and Safari splits ancestors when `document.execCommand("insertImage")`
inserts an `<img>`, but we insert into the closest inline element. For example,
```html
<b>A[]B</b>
```
Chrome and Safari make it to:
```html
<b>A</b><img><b>B</b>
```
But Firefox makes it to:
```html
<b>A<img>B</b>
```
I think that we should not change the behavior on Thunderbird. Therefore, the
behavior is controlled with the new `options` argument and the new behavior
runs only when the `HTMLEditor` works for content document and it's not caused
by the XPCOM method.
Differential Revision: https://phabricator.services.mozilla.com/D225037