The header classes for specific levels of headers, which should set the size of each header did not match the classes in the editor. This commit fixes that.

and `formatting-header4` -> `formatting-header-4` for consistency.

Issue #2191

Prevents issue where the cursor blinks but an iframe is focused,
so typing doesn't end up in the editor.

It seems that, though they changed their userAgent string
completely, they did keep most of their bugs.

Fixes copy/select-all from context menu.

Closes #1983

Closes #2188

... UNLOGGED, add keyword: cascade

(otherwise there is an error if all is minified in one file)

Some properties were outdated and some other were missing according to last
version of the CSS Grid Layout spec:
http://www.w3.org/TR/css3-grid-layout/#property-index

Issue #2180

Added a doc event "historyAdded" which is dispatched when a new entry is added to the document history. It is not dispatched when a history entry is amended. This allows CM's history to be integrated easily into application level undo/redo.

Signed-off-by: Grant Skinner <info@gskinner.com>

..with the newly added simple support for @keyframes

Closes #2161

Add unit tests.

Also resorted the next few lines so one would not stick out farther than
the others.

https://developer.mozilla.org/en-US/docs/Web/CSS/animation-fill-mode

Closes #2160

Closes #2162

Closes #2157

This way, it synchronously returns the current value, rather
than only being updated when an async focus/blur event fires.

Closes #2151

Return null from moveTillCharacter if nothing is found, so that if a
deletion operation is active but no match was found, nothing gets
deleted. Add a unit test for moveTillCharacter.

The method isn't present on all supported platforms, and these
tests tested someting very obscure, and already failed on the v4
branch which representes the editor content differently.

Issue #2152

Don't generate <span class="cm-"> nodes when token() returns only line-foo/line-background-foo styles.

On IE8 only scrollHeight - d.scroller.clientHeight + d.scrollbarV.clientHeight evaluates to -ve in some cases. Guard that with returning 0 in that case. Seems a bug in IE8, so this can be treated as a workaround.