updated for version 7.4.422
Problem:    When using conceal with linebreak some text is not displayed
	    correctly. (Grüner Gimpel)
Solution:   Check for conceal mode when using linebreak. (Christian Brabandt)
Added tag v7-4-422 for changeset 69da1498ce89
updated for version 7.4.423
Problem:    expand("$shell") does not work as documented.
Solution:   Do not escape the $ when expanding environment variables.
Added tag v7-4-423 for changeset 96a4fa8e530c