Rendering potentially 1000s of nodes can exceed the CPU and memory constraints
of a normal PHP process, as well as the rendering capabilities of browsers.
Set a hard maximum for the renderable nodes, deferring to a "show as list" action
in the main CMS tree. For TreeDropdownField, we don't have the list fallback option,
so ask the user to search for the node title instead.
Also makes both the "node_threshold_total" and "node_threshold_leaf" values configurable
Partially reverts "fixes" from 411673ed. This re-introduces the arrow on the main tree node in the CMS ("Your site name"), but that's less important than being able to navigate tree hierarchies in the first place in TreeDropdownField.
Add extra preview-mode selector to the CMS actions so we can show
something when the preview is closed (and with it all options are not
visible).
Thanks @mateusz, @clarkepaul and @robert-h-curry for contributing.
Remove arrow from sitetree next to site name #7972
Remove 1px gap from above main tabs and enhance css
Replace loading logo
Adjust main link colour to have more contrast
Add more contrast to main edit panel - made bg slightly lighter
* Increased height of site tree checkbox by 3px, so users are less
likely to miss it and load a page by mistake
* Refactored _tree.scss to make better use of SCSS, and stop repetition
of styles
If you're logged in as a specific user in a group who has view/edit
permissions of a page that has a parent page which doesn't have
permissions, you can't expand the tree node to get access to that
nested page.
This fixes LeftAndMain.Tree.js to allow expanding if there are
immediate children tree nodes that are not disabled. Also fixes
styling so that only immediate children nodes are greyed out.
Fixes this ticket: http://open.silverstripe.org/ticket/7913
