void showDiffForOne(@NotNull AnActionEvent e,
                      @NotNull Project project,
                      @NotNull FilePath filePath,
                      @NotNull VcsFileRevision previousRevision,
                      @NotNull VcsFileRevision revision);
void showDiffForOne(@NotNull AnActionEvent e,
                      @NotNull Project project,
                      @NotNull FilePath filePath,
                      @NotNull VcsFileRevision previousRevision,
                      @NotNull VcsFileRevision revision)