displayBuffer::lineForRow -> tokenizedLineForRow
lineForBufferRow -> lineTextForBufferRow
tokenizedLineForRow -> tokenizedLineForScreenRow
lineForScreenRow -> tokenizedLineForRow

The method was severely mislabeled
Remove unused method
row -> bufferRow for clarity
DisplayBuffer::linesForRows -> ::tokenizedLinesForScreenRows

Clarity!
Rename unused method
Editor::lineForScreenRow -> ::tokenizedLineForScreenRow
lineForBufferRow -> lineTextForBufferRow
Editor::linesForScreenRows -> ::tokenizedLinesForScreenRows
Deprecate Editor::lineLengthForBufferRow
Add Editor::lineTextForScreenRow()

Closes #3055
Gracefully handle the case when there is no screenline
Merge pull request #3445 from atom/bo-line-for-row

lineForRow changes