Unable to select or deselect columns to be displayed in lists #410
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Description of the issue/feature this PR addresses
When the user do a right-click in lists header, a popup with the list of available columns for the current view is displayed. An ok symbol appears next to the items their columns are already displayed in the list. By using this popup list, the user can choose which columns must be displayed or not based on his/her preferences (this configuration is stored in a cookie). Nevertheless, the list always display the columns set by default, regardless of the configuration set by the user.
Linked issue: #360 Listing Tables: Columns not selectable/deselectable
Current behavior before PR
Lists always displays the columns set by default, regardless of the configuration set by the user.
Desired behavior after PR is merged
Lists displays the columns the current user selected by making use of the popup for selection/deselection of items.
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I confirm I have tested this PR thoroughly and coded it according to PEP8
and Plone's Python styleguide standards.