Dragged blocktypes freeze; disappear under content area in IE

https://reviews.mahara.org/#change,872

Reviewed: https://reviews.mahara.org/872
Committed: http://gitorious.org/mahara/mahara/commit/46c990eabf7bcdbb37f06d20a7a66096da64cdd3
Submitter: Francois Marier (<email address hidden>)
Branch: master

commit 46c990eabf7bcdbb37f06d20a7a66096da64cdd3
Author: Richard Mansfield <email address hidden>
Date: Fri Nov 18 16:23:30 2011 +1300

    Stop blocktype images from freezing during drag in IE (bug #891916)

    When dragging a blocktype in the view editor in IE, dragging it very
    slowly usually causes the block to suddenly disappear, and the cursor
    to turn into a crossed circle. If you let go of the mouse, the
    blocktype image appears at the cursor, and clicking the mouse again
    will drop the blocktype. This can be fixed by disabling IE's default
    startdrag function.

    Change-Id: I03b3150dbdef7f59f6f638d0cc71a773df5de576
    Signed-off-by: Richard Mansfield <email address hidden>

Reviewed: https://reviews.mahara.org/873
Committed: http://gitorious.org/mahara/mahara/commit/20ead13e106fa8a203ac8cc43d09ee53e292c404
Submitter: Francois Marier (<email address hidden>)
Branch: master

commit 20ead13e106fa8a203ac8cc43d09ee53e292c404
Author: Richard Mansfield <email address hidden>
Date: Fri Nov 18 16:24:24 2011 +1300

    Ensure dragged blocktype appears above view content area in IE (bug #891916)

    In IE, when dragging a blocktype image into the content area of the
    view editor, the image appears to slip underneath the white box saying
    "This area shows a preview of what your page will look like..." and
    then out the other side again. Setting the z-index property on the
    element containing blocktype list fixes the issue.

    Change-Id: I6bc28bcf790b89d7513144012e210527b8ae1710
    Signed-off-by: Richard Mansfield <email address hidden>

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