Adding 'add Comment' at unwanted places.

Issue Type: <b>Bug</b>

There seems to be a kind of leak where the 'add Comment' button leaks in other extensions like github pull requests. And it is trying to send malformed json
https://github.com/microsoft/vscode-pull-request-github/issues/1454

Extension version: 2.1.5
VS Code version: Code - Insiders 1.41.0-insider (615732feae7228502eab60919d67837f7a625e7c, 2019-11-27T05:36:11.009Z)
OS version: Darwin x64 17.7.0

<details>
<summary>System Info</summary>

Item	Value
CPUs	Intel(R) Core(TM) i7-4980HQ CPU @ 2.80GHz (8 x 2800)
GPU Status	2d_canvas: enabled<br>flash_3d: enabled<br>flash_stage3d: enabled<br>flash_stage3d_baseline: enabled<br>gpu_compositing: enabled<br>metal: disabled_off<br>multiple_raster_threads: enabled_on<br>oop_rasterization: disabled_off<br>protected_video_decode: unavailable_off<br>rasterization: enabled<br>skia_renderer: disabled_off<br>surface_control: disabled_off<br>surface_synchronization: enabled_on<br>video_decode: enabled<br>viz_display_compositor: enabled_on<br>viz_hit_test_surface_layer: disabled_off<br>webgl: enabled<br>webgl2: enabled
Load (avg)	2, 3, 3
Memory (System)	16.00GB (0.18GB free)
Process Argv	-psn_0_16252799
Screen Reader	no
VM	0%

</details>

Comments (5)