Problems pane badge not updated until first visited

[eamodio]

• VSCode Version: Code - Insiders 1.20.0-insider (673355d, 2018-01-22T05:14:14.888Z)
• OS Version: Windows_NT x64 10.0.17074

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The new (?) feature that shows problems in the file explorer caused me to notice that the Problems pane badge doesn't update to reflect any "problems" until you visit it the first time. I've also started noticing that sometimes the decoration in the file explorer sometimes sticks on a file (even though it doesn't have any problems) -- probably an issue with the typescript language service or something (as I've had the red squiggles in the editor persist too even when the error was resolved).

Steps to Reproduce:

1. Open vscode, but make sure to be in the terminal pane or something other than the Problems pane (if not restart)
2. Open a document and make an edit that will cause errors
3. Observe that the file explorer will show the errors, but the Problems pane badge will not be visible, until you switch to that pane -- after which it will update

Reproduces without extensions: Yes/No