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Patch for "master" branch: https://reviews.mahara.org/10992

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https://bugs.launchpad.net/bugs/1880803

Title:
  errors when copying a page after editing column widths manually

Status in Mahara:
  In Progress
Status in Mahara 19.04 series:
  Confirmed
Status in Mahara 19.10 series:
  Confirmed
Status in Mahara 20.04 series:
  Confirmed
Status in Mahara 20.10 series:
  In Progress

Bug description:
  For any version newer than 19.04, follow the steps below and then
  upgrade. It will display the same errors when trying to copy or
  translate the view with the old layout.

  On 19.04

  to replicate:
  - go to User menu-> Preferences -> Settigns
  - set 'Show controls to add and remove columns when editing a page' to yes and save
  - create a view
  - set a custom layout e.g. 3 rows with 3 columns and 1 row with 1 column
  - play with the column changing the widths
  - display the page and make a copy and try to edit the view

  the following errors are displayed

  [WAR] 28 (lib/view.php:2994) Undefined offset: 4
  Call stack (most recent first):

      log_message("Undefined offset: 4", 8, true, true, "/home/ceciliavg/maharacode/mahara/htdocs/lib/view....", 2994) at /home/ceciliavg/maharacode/mahara/htdocs/lib/errors.php:520
      error(8, "Undefined offset: 4", "/home/ceciliavg/maharacode/mahara/htdocs/lib/view....", 2994, array(size 4)) at /home/ceciliavg/maharacode/mahara/htdocs/lib/view.php:2994
      View->removerow(array(size 2)) at /home/ceciliavg/maharacode/mahara/htdocs/view/editlayout.php:701
      set_view_layout(object(Pieform), array(size 16)) at /home/ceciliavg/maharacode/mahara/htdocs/view/editlayout.php:643
      settings_submit(object(Pieform), array(size 16)) at /home/ceciliavg/maharacode/mahara/htdocs/lib/pieforms/pieform.php:544
      Pieform->__construct(array(size 5)) at /home/ceciliavg/maharacode/mahara/htdocs/lib/pieforms/pieform.php:166
      Pieform::process(array(size 5)) at /home/ceciliavg/maharacode/mahara/htdocs/lib/mahara.php:5445
      pieform(array(size 5)) at /home/ceciliavg/maharacode/mahara/htdocs/view/editlayout.php:222
      create_settings_pieform() at /home/ceciliavg/maharacode/mahara/htdocs/view/editlayout.php:106

  [WAR] 28 (lib/view.php:2994) Undefined offset: 3
  Call stack (most recent first):

      log_message("Undefined offset: 3", 8, true, true, "/home/ceciliavg/maharacode/mahara/htdocs/lib/view....", 2994) at /home/ceciliavg/maharacode/mahara/htdocs/lib/errors.php:520
      error(8, "Undefined offset: 3", "/home/ceciliavg/maharacode/mahara/htdocs/lib/view....", 2994, array(size 4)) at /home/ceciliavg/maharacode/mahara/htdocs/lib/view.php:2994
      View->removerow(array(size 2)) at /home/ceciliavg/maharacode/mahara/htdocs/view/editlayout.php:701
      set_view_layout(object(Pieform), array(size 16)) at /home/ceciliavg/maharacode/mahara/htdocs/view/editlayout.php:643
      settings_submit(object(Pieform), array(size 16)) at /home/ceciliavg/maharacode/mahara/htdocs/lib/pieforms/pieform.php:544
      Pieform->__construct(array(size 5)) at /home/ceciliavg/maharacode/mahara/htdocs/lib/pieforms/pieform.php:166
      Pieform::process(array(size 5)) at /home/ceciliavg/maharacode/mahara/htdocs/lib/mahara.php:5445
      pieform(array(size 5)) at /home/ceciliavg/maharacode/mahara/htdocs/view/editlayout.php:222
      create_settings_pieform() at /home/ceciliavg/maharacode/mahara/htdocs/view/editlayout.php:106

  [WAR] 28 (lib/view.php:2994) Undefined offset: 2
  Call stack (most recent first):

      log_message("Undefined offset: 2", 8, true, true, "/home/ceciliavg/maharacode/mahara/htdocs/lib/view....", 2994) at /home/ceciliavg/maharacode/mahara/htdocs/lib/errors.php:520
      error(8, "Undefined offset: 2", "/home/ceciliavg/maharacode/mahara/htdocs/lib/view....", 2994, array(size 4)) at /home/ceciliavg/maharacode/mahara/htdocs/lib/view.php:2994
      View->removerow(array(size 2)) at /home/ceciliavg/maharacode/mahara/htdocs/view/editlayout.php:701
      set_view_layout(object(Pieform), array(size 16)) at /home/ceciliavg/maharacode/mahara/htdocs/view/editlayout.php:643
      settings_submit(object(Pieform), array(size 16)) at /home/ceciliavg/maharacode/mahara/htdocs/lib/pieforms/pieform.php:544
      Pieform->__construct(array(size 5)) at /home/ceciliavg/maharacode/mahara/htdocs/lib/pieforms/pieform.php:166
      Pieform::process(array(size 5)) at /home/ceciliavg/maharacode/mahara/htdocs/lib/mahara.php:5445
      pieform(array(size 5)) at /home/ceciliavg/maharacode/mahara/htdocs/view/editlayout.php:222
      create_settings_pieform() at /home/ceciliavg/maharacode/mahara/htdocs/view/editlayout.php:106

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