Feature request: remember hints for already followed links within the current tab

I think this feature would speed up working with single page applications or other sites that dynamically add and remove links from the page.

For example:

1. I'm at awesome-web-app.tld in view 0 and use vimium hints to click an element that doesn't navigate away from the single page application but goes to view 1. The hint for view 1 is a.
2. I want to go to view 2 to check something, and use hints again. view 2 has some extra links in it. The hint is not relevant to this example.
3. I have now checked it, and want to go back to view 1. The hint for view 1 is not a.

Step 3. with the feature: the hint is a.

I can try to implement the feature myself but I have never used CoffeeScript before and I don't know anything about the code base yet. Also, maybe not enable it automatically for everybody if it would be too heavy on CPU.

I'm using Vimium-FF on Firefox but I don't know how different it's from the code in this repository if at all.

No files or tests are named. Start by tracing Vimium's hint generation and current-tab state, then reproduce the three-view single-page-application flow described in the issue. Done means a revisited view receives its earlier hint without disrupting other views, with the CPU impact or opt-in behavior clarified.