Editors are not reopened after restart when using Electron example

[MarkZ3]

Using master as of commit 9f60988

1. Start the Electron app from examples/electron, with 'yarn run start'
2. Open a file
3. Close windows and terminate the backend (Ctrl+C)
4. Re-run 'yarn run start': editor is not reopened.

This seems to work fine in the browser version.

[MarkZ3]

I should add, doing "Reset workbench layout" did not fix it.

[hexa00]

Confirmed.

The editors seems to be saved properly however I see in the Local Data:

"{\"mainArea\":{\"activeWidgets\":[{\"constructionOptions\":{\"factoryId\":\"code-editor-opener\",\"options\":\"file:///home/eantotr/src/theia/CONTRIBUTING.md\"}}],
\"main\":{\"type\":\"tab-area\",\"widgets\":[{\"constructionOptions\":{\"factoryId\":\"code-editor-opener\",\"options\":\"file:///home/eantotr/src/theia/CODE_OF_CONDUCT.md\"}},{\"constructionOptions\":{\"factoryId\":\"code-editor-opener\",\"options\":\"file:///home/eantotr/src/theia/CONTRIBUTING.md\"}}],\"currentIndex\":1}},\"leftBar\":{\"activeWidgets\":[{\"constructionOptions\"

Must be something with the restore...

[hexa00]

@svenefftinge This is because now we store per location and that electron is using dynamic port allocation so since #905 the electron app restore is broken...

[svenefftinge]

I reverted it 49a86f3

[MarkZ3]

works, thanks!