Is your feature request related to a problem? Please describe.
Support for expansion and collapse of the process like this:

• Expansion moves external elements to sides, even if they are on middle they move to some side
• Expansion does not affect child elements
• Expansion increases the size of the parent process

<subProcess id="collapsedSubProcess" name="Collapsed subprocess name" flowable:async="true">
            <documentation>Collapsed sub process docs</documentation>
            <multiInstanceLoopCharacteristics isSequential="false" flowable:collection="COLLECTION" flowable:elementVariable="ELEM_VAR">
                <loopCardinality>12</loopCardinality>
                <completionCondition>completionCondition</completionCondition>
            </multiInstanceLoopCharacteristics>
</subProcess>

Feature analysis:

• Excessive complexity of changing diagram in 'expanded' state

TODOs:

• Capability to add collapsed subprocess
• Elements inside collapsed subprocess should have relative coordinates to parent
• Prevent moving intermediate waypoints if expanded subprocess is active on a given level
• Prevent resizing other
• Warning that some features were disabled when process was expanded
• Incorrect new sequence element inside collapsed subprocess start/end coordinates (unexpanded)
• New sequence element inside collapsed subprocess/subprocess should not select (parent) subprocess
• Expansion of collapsed subprocess within another collapsed subprocess
• Resizing elements works smoothly
• Editing of collapsed and expanded collapsed subprocess size
• Prevent moving expanded collapsed subprocess as it causes severe visual distortions
• Element editing inside the collapsed subprocess
• Subprocess and alike elements should shield their children from external expansion view transform
• Correct location inversion when adding a new element (currently they are misplaced)
• Fix boundary and informal element rendering (i.e. delete action) as it does not take expansion view in account
• Misplaced expansion/collapse icon on expanded process

Shortcomings that can't be fixed due to displacement jumps:

• Not all locations can be inverted - causes jumpy behavior of dragging element action
• Edge midpoints may occur outside of edge

Requirements:

• Expandable (including within subprocess) collapsed subprocess
• Analyze iterative inverse transform
• Read-only mode if at least one collapsed subprocess expanded
• Simple expansion view transformation
• Expansion propagates from bottom-to-top, but subprocess should shield its children from outer expansion
• Edit icon, to edit collapsed subprocess in-same-window (like flowable modeler)