"apply Changes" has discarded all my changes.

[b6pzeusbc54tvhw5jgpyw8pwz2x6gs]

Issue Type: Bug

• There is the file named a.txt in the master branch.
• I edited contents of a.txt and save in VS Code.
• in GITLENS view, master -> 1 file changed -> a.txt -> mouse right click -> select "apply changes" to move changes into staged area.
• But nothing happened except the changes were all gone.
  file, right click on the master -> 1 file changed -> a.txt in the
• Due to "apply changes" GITLENS, I lost all my work for two hours.

VS Code version: Code 1.24.1 (24f6262, 2018-06-13T17:41:50.128Z)
OS version: Darwin x64 17.5.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-7660U CPU @ 2.50GHz (4 x 2500)
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)	4, 3, 3
Memory (System)	16.00GB (0.11GB free)
Process Argv	/Applications/Visual Studio Code.app/Contents/MacOS/Electron -psn_0_9341160
Screen Reader	no
VM	0%

Extensions (10)

Extension	Author (truncated)	Version
vscode-docker	Pet	0.0.27
vagrant	bbe	0.5.0
vscode-instant-markdown	dba	1.4.2
githistory	don	0.4.2
gitlens	eam	8.4.1
vsc-material-theme	Equ	2.3.0
prettier-vscode	esb	1.5.0
mssql	ms-	1.4.0
python	ms-	2018.6.0
markdown-pdf	yza	1.2.0

[b6pzeusbc54tvhw5jgpyw8pwz2x6gs]

gitkraken/vscode-gitlens#451