'File Order Sources' block covers 'State/Node' block in 'Chain Nodes' window on Linux

Current Situation

• The 'File Order Sources' block covers the 'State/Node' block in the 'Chain Nodes' window on Linux. This behaviour does not apply to Windows.
• The 'State/Node' block does not get a scrollbar if the nodes table extends outside the space available (for example, with a smaller window and/or a long job chain).
• As a result you cannot see / reach later jobs in job chain.

Desired Behavior

• Being able to edit file order sources for Unix in the same ways as for Windows.
• Possible solution: block 'Chain Nodes' window modified to use a 'tabbed interface'.