"editorUnnecessaryCode.border" not working

[chrmarti]

Issue Type: Bug

Testing #52218

It doesn't show as border:

In other cases it doesn't show at all:

VS Code version: Code - Insiders 1.25.0-insider (f2fa6be, 2018-06-27T05:11:02.122Z)
OS version: Darwin x64 17.6.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz (8 x 2200)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: enabled rasterization: enabled video_decode: enabled video_encode: enabled vpx_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	3, 3, 3
Memory (System)	16.00GB (0.73GB free)
Process Argv	/Applications/Visual Studio Code - Insiders.app/Contents/MacOS/Electron --extensions-dir /Users/chrmarti/Development/repos/tmp/ext --user-data-dir /Users/chrmarti/Development/repos/tmp/user
Screen Reader	no
VM	20%

Extensions: none

[mjbvz]

In the first example, I believe it is showing as expected. The green dashes are the border

In the second example, we don't show the additional border because the squiggly already exists. We only show editorUnnecessaryCode.border if there no other marker