Partial fix for sensitivity setting (closes bgo#638629)
Sensitivity for MeldApp-mediated actions has to be handled on container switch. FileDiff didn't handle this aggressively enough, and neither DirDiff or VcView handled it at all. With this commit, FileDiff emits the next-diff-changed signal correctly, and DirDiff and VcView emit dummy values; this corrects the regression from previous behaviour.
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