Make predicate for some `TreeView` commands stricter

This avoids performing the `treeview:new-folder` command on ctrl + 
double click.
This happens because `ctrl+lclick` (which is the keybinding for 
`treeview:new-folder`) is triggered also by ctrl + double click, which 
isn't captured by anything else.

data/plugins/treeview.lua

@@ -733,6 +733,8 @@ command.add(
 
 
 command.add(function()
+    if not (core.root_view.overlapping_node and core.root_view.overlapping_node.active_view) then return end
+    if core.root_view.overlapping_node.active_view ~= view then return end
     local item = treeitem()
     return item ~= nil, item
   end, {