Autocompletion per variable path element for Structure and Array variables

[D8H]

Context

• In expression fields or in variable fields
• The beginning of the parent name is input

Actual

• The autocompletion gives the parent and every child
  ##Expected
• The autocompletion gives only the parent variables
• When the user chooses a parent variable, the cursor goes after the dot, its children are shown in autocompletion and so on.

Technical solution

The parser creates a node for each path element VariableAccessorOrVariableBracketAccessorNode, it could be use by ExpressionCompletionFinder to give autocompletion descriptions.

Also see

• Florian comment Variable autocompletion in expressions #2692 (comment)
• a related issue: Show child variable references in autocompletion #2679

Alternatives considered

• It's still usable as it is.