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If the user tries to open an encrypted file, zathura aks for the password
in form of a dialog.

It is now possible to enable a fullscreen mode.

Conflicts:
	config.def.h
	zathura.c

With this commit zathura selects the text in the selected
rectangle and copies it to the clipboard.

This commit calculates the rectangle that will be drawn
correctly. Now the mapped rectangle is calculated wrong,
but it gets the text of the document and copies it to
the clipboard.

This commit draws an rectangle in the marked area.

This commited introduces a GtkEventBox called document
that is responsible for catching all mouse events like
"released" or "motion".

Two callbacks for "scroll" and "click" events
has been defined and connected to the view.

With this commit zathura selects the text in the selected
rectangle and copies it to the clipboard.

This patch fixes the wrong re-recalculation of the
search item - rectangles.

Replaced document_lock with a more general pdf_obj_lock

This commit is a incomplete patch to highlight the search
results again.

This patch checks while opening the pdf document
if it is reasonable to activate the goto label mode:
Sometimes all labels match their page number and then
the label goto mode will slow the navigation down.