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Patch for "master" branch: https://reviews.mahara.org/8354

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https://bugs.launchpad.net/bugs/1731807

Title:
  Remove unused code from lib/view.php that was never used correctly

Status in Mahara:
  Confirmed

Bug description:
  I noticed a bug in the
  theme/raw/templates/view/blocktypecontainerediting.tpl where there
  were two closing </button> tags to the one opening <button> tag (see
  lines 37/38)

  So I wondered why this didn't cause a problem rendering the page and
  found the code would only be rendered if $configure was true.

  And that would only happen if a block instance called render_editing
  with $configure = true

  And I noticed on view/blocks.php that happens when 
  $blockid = $view->get_blockinstance_currently_being_configured();

  But $view->get_blockinstance_currently_being_configured(); always
  returns 0 as the set_blockinstance_currently_being_configured() is
  never called.

  Changing the number from 0 to a valid block number on an edit screen
  and then reloading page gives all manner of errors.

  Looking at the commit that added the set/get functions
  09c73752c11c800dcb2bfbb6606206831f19d439 this was before 1.0 release
  and doesn't look to have been implemented fully.

  We should clean up this area and remove any/all code that is not
  actually being used

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