Menu action Toggle Render Whitespace is a no-op if editor does not have focus

[vsccarl]

• VSCode Version: 0.10.12-alpha
• OS Version: Windows 10

Steps to Reproduce:
I think related to #2110 possibly a regression

1. Open a project folder with cursor not in the editor
2. View -> Toggle Render Whitespace

Actual:
Toggle does not show whitespace dots until the cursor is placed in the editor window regardless of how many times you toggle.

Expected:
Cursor does not need to be in the editor to toggle whitespace

[Tyriar]

I can reproduce, to clarify "cursor" is talking about the text cursor, not mouse cursor.

[alexdima]

This works now. I am opening a file, then clicking in the git commit box and pressing alt+z