Bug 733825 - Busy loop/deadlock when changing paragraph style in quoted part

We have to insert the text node that marks the end of the block on
right position.
EHTMLEditorView - Avoid forcing of the spell check when the body has no children
EHTMLEditorView - Avoid wrapping of the preformatted block when it is inside the quoted text
Bug 733725 - Runtime critical when pasting test from the same composer instance

Fix the warnings and also fix the wrong structure of the composer
content when we were pasting multiline content into the composer.