Error when tap on "." char

[sci92bior]

After a successful implementation of your calculator to my app unfortunately I received an error. When I tap on dot after I chose a number, Flutter throw me something like this:

'SubListIterable' is not a subtype of type 'List'

When the exception was thrown, this was the stack:
#0 MathFormula.getSymbols (package:flutter_calculator/src/math_formula.dart:122:5)
#1 MathFormulaValidator.isAccepted (package:flutter_calculator/src/math_formula_validator.dart:73:12)
#2 MathFormula._addSymbolAtCursor (package:flutter_calculator/src/math_formula.dart:168:26)
#3 MathFormula.process (package:flutter_calculator/src/math_formula.dart:81:14)
#4 _MathFormulaViewState._processMathSymbolAtCursor (package:flutter_calculator/src/math_formula_view.dart:115:19)

[flytreeleft]

@sci92bior Thank you. I just confirmed that it is a bug. I will fix it as soon as possible :).

[flytreeleft]

@sci92bior The bug is already fixed, please try to use the latest code. Thanks!

[sci92bior]

@flytreeleft thank's a lot! Excellent work!