The new imageAt() method pairs with the existing anchorAt() method, and
allows retrieving the source link of the image under the cursor.
We also expose the common logic between these two methods as an
additional formatAt() method.
[ChangeLog][QtGui][QAbstractTextDocumentLayout] Added imageAt() and
formatAt() methods, which respectively can be used to retrieve the
source link of the image under the cursor, or the QTextFormat of the
text under the cursor.
Change-Id: If09815dde91de6616edcb19c72c462dbf7abd8ef
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>
fb6000a74f