Using PyQt 4.5.4, I'm getting strange behaviour with sliders. Everything works as expected when the slider handle is dragged, but not when the Left/Right keys are used (this is a horizontal slider). What happens here is the Left key works OK, being able to take the value all the way down to 0, but the Right key increases the value a few times then starts switching back and forth between n and n+1, where it isn't obvious what determines n, but in any case it's not determined by the maximum value set for the slider. Two slider both have a maximum value set at 100. After moving the slider handle to 0, one slider will only move to the right to 2 before switching between 1 and 2, while the other goes up to 36 37 36 ...

Is this a known bug, or does it suggest an error in my code?

I'm using PyQt 4.5.4 because 4.7 doesn't work with PyQwt 5.2.0.
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