language page graph is not rendering properly

[ghamerly]

/icat/language.php, in the "Percentage of results per language", all bars should sum to 100%. However, I have seen an example where the stacked bars overlap, and the top of the stack does not reach 100%, even though the associated percentages do add up to 100%.

Here's a screenshot. The rightmost stack of bars should go up to 100%, but the bottom two parts ("compile error" in yellow, "accepted" in green) overlap:

I would guess the issue is that "compile error" is getting the wrong y-coordinate for some reason (it should probably be at the top).

[eldering]

See also #24.