fixed PY-10964 Extract variable doesn't work as expected inside brackets
fixed PY-10221 Refactor->Extract->Variable may break square bracket symmetry and may break user input

there are overlapped reference in python for slice expression (P['x']) one for the reference itself, one for the operator [
Merge remote-tracking branch 'origin/master'
fix testdata
overrides
IDEA-50801 Evaluate expression: expand root node automatically +review