The whole treeview is rerendered when an update event being triggerred

[rebornix]

Issue Type: Bug

• Install GH PR or GitLens
• Go to a tree view contributed by the extension, hit refresh button on the title
• The whole tree view is rerendered.

VS Code version: Code - Insiders 1.30.0-insider (048fdbb, 2018-12-06T06:17:10.993Z)
OS version: Windows_NT x64 10.0.17134

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz (8 x 3600)
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: disabled_software rasterization: enabled video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Memory (System)	31.92GB (10.75GB free)
Process Argv
Screen Reader	no
VM	0%

Extensions (10)

Extension	Author (truncated)	Version
vscode-eslint	dba	1.7.0
gitlens	eam	9.0.3
tsl-problem-matcher	eam	0.0.4
tslint	eg2	1.0.40
vscode-pull-request-github-insiders	Git	0.338.0
Angular2	joh	7.0.1
vscode-typescript-tslint-plugin	ms-	0.1.1
debugger-for-chrome	msj	4.11.1
toggle	reb	0.0.1
vscodeintellicode	Vis	1.1.0

(4 theme extensions excluded)

[sandy081]

@rebornix Good catch

This was caused because of #63906. I am hiding the tree container when it is empty so that there is only focusable container for message.

Fix is to hide tree only when there is a message and tree is not refreshing and empty.

[sandy081]

Verify that views with and without message are getting refreshed without getting hidden. Use References List and Github PR tree for testing.