matplotlib__matplotlib-22711
Based on the issue description and hints, I can understand the bug and create the fix. The issue is:
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Content
Based on the issue description and hints, I can understand the bug and create the fix. The issue is:
1. When `RangeSlider` is initialized with `valinit` where both values are equal (e.g., `[0.0, 0.0]`), the polygon created by `axhspan`/`axvspan` has only 4 vertices instead of 5.
2. The `set_val` method tries to access `xy[4]` to close the polygon, but when the polygon was created with equal values, it only has 4 vertices.
The fix should be to create the polygon manually with the expected number of vertices, rather than relying on `axhspan`/`axvspan` which produces different array sizes depe
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