Cannot read property 'provideDecoration' of undefined

[chrmarti]

Issue Type

Bug

Description

I was testing #42195 (the workspace folder API):

TypeError: Cannot read property 'provideDecoration' of undefined
at /usr/share/code-insiders/resources/app/out/vs/workbench/node/extensionHostProcess.js:534:586
at /usr/share/code-insiders/resources/app/out/vs/workbench/node/extensionHostProcess.js:98:524
at new n.Class.derive._oncancel (/usr/share/code-insiders/resources/app/out/vs/workbench/node/extensionHostProcess.js:75:657)
at Object.t.asWinJsPromise (/usr/share/code-insiders/resources/app/out/vs/workbench/node/extensionHostProcess.js:98:487)
at /usr/share/code-insiders/resources/app/out/vs/workbench/node/extensionHostProcess.js:534:551
at Array.map (native)
at e.$provideDecorations (/usr/share/code-insiders/resources/app/out/vs/workbench/node/extensionHostProcess.js:534:475)
at e._doInvokeHandler (/usr/share/code-insiders/resources/app/out/vs/workbench/node/extensionHostProcess.js:579:983)
at e._invokeHandler (/usr/share/code-insiders/resources/app/out/vs/workbench/node/extensionHostProcess.js:579:701)
at e._receiveRequest (/usr/share/code-insiders/resources/app/out/vs/workbench/node/extensionHostProcess.js:578:836)

VS Code Info

VS Code version: Code - Insiders 1.20.0-insider (8adf87c, 2018-01-31T06:18:41.654Z)
OS version: Linux x64 3.13.0-108-generic

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz (4 x 2194)
Load (avg)	0, 0, 0
Memory (System)	3.86GB (0.17GB free)
Process Argv	/usr/share/code-insiders/code-insiders --enable-proposed-api
Screen Reader	no
VM	100%

Extensions: none Reproduces only with extensions

[jrieken]

@chrmarti Did you by any change cause an extension host reload with adding/removing folders?

[chrmarti]

No, I was rotating folders 1..n-1.

[jrieken]

Thanks

[chrmarti]

Pushed it here, in case you need to reproduce it: https://github.com/chrmarti/test42195.git