Evas textblock: Fixed a bug with format invalidation.
Evas textblock: Fixed a bug with format invalidation.

With the following example text: "aa<b>a <i>bbb</i> ccc", adding a </b>
at the end wouldn't cause an invalidation to happen as expected.

git-svn-id: 24a995eca3b83137dd7eab3408044d7832e202f7@61805 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33

antognolli/Evas,antognolli/Evas,antognolli/Evas,antognolli/Evas