Tapping outside of pie chart intercepts the gesture

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**Describe the bug**
I have 2 pie charts stacked on top of eachother. I cannot intercept the gesture on the bottom pie chart. I set up a print statement to get the index for each segment on the top one and i notice it prints -1. So that tells me the transparent area behind the piechart is intercepting the getstures.

**To Reproduce**
Put a pie chart on top of a box (or any other widget) of the same width as the pie chart that has a gesture recognizer. Try and get the box underneath to respond to touches just outside of the circular pie chart. The box underneath does not respond.

**Screenshots**
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**Versions**
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Start by reproducing the stacked pie-chart and box setup described in the issue, then inspect the pie chart's gesture handling for taps outside the circular chart area. Done means the underlying box responds to touches outside the pie chart while the pie chart still handles touches on its segments.

Written by the indexing model from the issue text.