Gradient Mesh does not show handle
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#### Steps to reproduce:
<!-- Describe what you did (step-by-step) so we can reproduce: -->
- Open Inkscape
- Create a rectangle or circle
- Generate a gradient mesh by clicking on gradient mesh tool
- Observe that the handles do not show up
#### What happened?
- Gradient mesh handles do not show up.

...
#### What should have happened?
- Gradient mesh handles show up
...
#### Information
- Inkscape Version: Inkscape 1.0alpha2 (4ce689b25c, 2019-06-24)
- Operating System: Windows 10 x64 Home Edition
- Graphic Card: NVIDIA Quadro K4200
Inkscape Setting
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- Number of Threads: 8
- Rendering Cache Size: 64 MB
- Rendering Tile Multiplier: 16
- Rendering XRay Radius: 100
issue