Setting combo layout issue when opened "above"

[chrmarti]

Issue Type: Bug

Testing #57304

VS Code version: Code - Insiders 1.27.0-insider (f881f8c, 2018-08-28T09:47:27.146Z)
OS version: Darwin x64 17.7.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz (8 x 2200)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off 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 webgl: enabled webgl2: enabled
Load (avg)	7, 4, 3
Memory (System)	16.00GB (0.06GB free)
Process Argv	/Applications/Visual Studio Code - Insiders.app/Contents/MacOS/Electron --user-data-dir /Users/chrmarti/Development/repos/tmp/user2 --extensions-dir /Users/chrmarti/Development/repos/tmp/ext2
Screen Reader	no
VM	33%

Extensions: none

[roblourens]

#57447