[hist] Extend the region in which TH3::Interpolate can be used #20988
+56
−25
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When a user asks to interpolate a value close to the edges of an axis,
the function would generate an error. This is inconsistent with the TH1
version of Interpolate.
Here, the valid range is extended by assuming that the histogram is
constant at the axis limit (i.e. the imaginary next bin outside the axis
limits has the same bin content as the last bin inside the limits). From
here, the trilinear interpolation proceeds as usual.
Fix #10678