BPMN Editor - Cannot properly edit Expressions in the Data Assignments

There exist a bug on the expression field for the data assignments component, which prevents from editing an existing expression, in case the expression is longer than textbox size.

Also as an improvement, for a proper authoring/editing, restyling the expression field in some way to make it more usable would also help. Two quick solutions are possible for the expression field:

• Making the input field larger

Acceptance Criteria

1. Data I/O dialog increased to 1200px and all fields are increased as well. Field supporting Expressions should be the longest, package should be a bit longer than name.
2. It should be possible to edit Expression value despite of it's size