Save As - document keep failure
Save As - document keep failure

- add a comment to explain the causes of keep failure,

- rename the keep failure response callback to fit convention,

- fix typo and whitespace nearby.

quozl/sugar-toolkit-gtk3,sugarlabs/sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3,sugarlabs/sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3,sugarlabs/sugar-toolkit-gtk3