SliceFilter::doFilter does not work with ranges

[textshell]

SliceFilter::doFilter tries splits the input into parts left and right from the ":" that divides the range to output.

  auto splitterIndex = argString.get().indexOf(QLatin1Char(':'));
  QString inputString = getSafeString(input);
  if (splitterIndex >= 0) {
    auto left = argString.get().left(splitterIndex).get().toInt();
    auto right = argString.get().right(splitterIndex).get().toInt();

But the right hand part is not correctly extracted, because QString::right expects the amount of characters from the right. It seems the code should be using QString::mid with the correct index adjustments instead.

Test cases:
data|slice:"0:10" returns the empty string, because it uses only "0" as right side.
data|slice:"00:-1" works because because "00" and "-1" are the same lenght.

[pcolby]

OMG! Thank you so much for reporting the workaround (aka "Test cases") - saved me a lot of time!!