Parameter hints do not get dismissed when the cursor moves

Presently, it appears that the parameter hint window does not get dismissed if it is brought up when invoking a function within the argument list of another function and you move out of the inner function's argument list. The popup changes to reflect its new position, but this is not a generally useful thing and in something like a giant argument list like a call to `webpackMerge` this is incredibly irritating. Couple this with the fact that the Vim extension does not dismiss the param hints when you press escape and it's pretty rough. It would be really nice if the parameter hints were dismissed when leaving the current argument list. I can see an argument for it remaining open while navigating around the current argument list, but if the cursor leaves that list and goes to an outer list, it should be dismissed. Thanks! <!-- Please search existing issues to avoid creating duplicates. --> <!-- Also please test using the latest insiders build to make sure your issue has not already been fixed: https://code.visualstudio.com/insiders/ --> <!-- Use Help > Report Issue to prefill these. --> - VSCode Version: 1.27.0 - insiders and 1.26.0 - OS Version: macOS 10.13.6 Steps to Reproduce: 1. Open a new file 2. Change to javascript mode 3. Enter the text: ```js const path = require('path') Array.isArray([ baz, ]) ``` 4. Place cursor on line after `baz` 5. Type `Array.apply(`. The parameter hint overlay should appear. 6. Press the up arrow. Expected: Parameter hint window is dismissed Actual: Parameter hint window remains covering code <!-- Launch with `code --disable-extensions` to check. --> Does this issue occur when all extensions are disabled?: Yes