If previous line ends with whitespace, or next line starts with whitepsace we need to preserve a space otherwise things line: RUN echo\ hello will appear as: RUN echohello Noticed this while looking at #5744 because he had lines ending in &&\ Signed-off-by: Doug Davis <dug@us.ibm.com> Upstream-commit: f440c6b2246cc4cfac4c5d351172e209dca2c765 Component: engine