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Axis scale erorr

See original GitHub issue

Dear all,

Is it possible to scale x-axis? No problem on y-axis…

# Plot the data points on an interactive axis
points = alt.Chart(df).mark_circle(color='black').encode(
    x=alt.X('Year:Q', title='Year', axis=alt.Axis(titlePadding=10, format = 'd', tickCount=15),
            scale=Scale(domain=[1984, 2019])),
    y=alt.Y('Number of rainy days', title='Number of rainy days', axis=alt.Axis(titlePadding=10)))


bar_linear = alt.Chart(prediction_df).transform_fold(
    ['Linear regression	'],
    as_=['degree', 'yfit']
).mark_line().encode(
    x=alt.X('Year:Q', scale=Scale(domain=[1984, 2019])),
    y=alt.Y('Linear regression'),
    color = alt.Color('degree:N', title = 'Type of regression')
)


# Plot the best fit polynomials
polynomial_fit = alt.Chart(wet_days_df).transform_fold(
    ['Cubic spline'],
    as_=['degree', 'yfit']
).mark_line().encode(
    x= alt.X('xfit:Q', scale=Scale(domain=[1984, 2019])),
    y= alt.Y('yfit:Q'),
    color = alt.Color('degree:N', title = 'Type of regression', scale=alt.Scale(range=['#d62728', '#1f77b4']))
)

points.properties(width=700, height=400) + polynomial_fit + bar_linear


**SchemaValidationError: Invalid specification

        altair.vegalite.v4.schema.core.Axis, validating 'additionalProperties'

        Additional properties are not allowed ('scale' was unexpected)**