InI found out that:
After dragging a block to another section, we see the message:
* The changes to these blocks will not be saved until the Save blocks button is clicked.
I don't know for sure that this is in the drupal messages box, if not we'll update the issue title/summary.
I assume that where this is happening it is done in a standard way. I also assume that other modules might be adding messages to this/some other standard container with JS.
This causes problems for users of AT (primarily screen-readers and magnifiers) as they may not notice the dynamically added message.
WAI-ARIA provides a live region, which indicates to AT that they should monitor a region of the DOM for changes. We should add this to drupal messages and / or wherever this is commonly occurring. We should add with JS, as the problem will only occur w/ JS enabled.
PASSED: [[SimpleTest]]: [PHP 5.5 MySQL] 101,466 pass(es). View
FAILED: [[SimpleTest]]: [PHP 5.4 MySQL] 69,052 pass(es), 12,404 fail(s), and 6,141 exception(s). View
PASSED: [[SimpleTest]]: [PHP 5.4 MySQL] 95,542 pass(es). View