* Move the "dynamicEdit" span at the beginning of the "value" div to let
it appear at the top left corner of the field to edit.
Otherwise, the edition block may appear outside the page, e.g. if we
want to edit the title of an issue and if this title ends at the
extreme right of the page.
* Display the pencil icon on a field only when this field is hovered
(not simply if the mouse hovers any part of the "content" div).
* Vertically align validate and cancel buttons of the edition block with
the edition field nearby.
* Auto resize the issue title edition input field based on the window
size (to leave as much space as possible to rewrite the title).
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