Only restore expansion state when there are items.

When a debugger needs more time while stepping, the tree will go empty first
(while running) and then come back with data (when stopped again). This
modifies the change for #16031 to allow the tree to properly restore
state in case a debugger needs more time providing content.

The expanded state is saved in a global variable. A check ensures that an
intermittent empty tree does not override the global variable. Future refreshes
of an empty tree will then restore the expanded state of variables.

fixes #36963

related to #35600

#3422 Add Region folding for bat

Fix #36924. PowerShell Extension Comment Highlighting Error

Add unique build number per build to support fuzzy settings search

Add experimentalFuzzySearchBoost so we can test changes to the 'boost' parameter in the search query

Fixes issue #36924 to correct a comment highlighting error in the PowerShell extension.

New versions of Gnome name the default action as New Window, this breaks
workspace restoring under Ubuntu 17.10 and presumably other distros on the
same verison of Gnome as well.

Fixes #36695