Support filtering follow hints

I’m opening this issue because:

• I’ll report a bug
• I’ll propose a new feature

Description

The first thing I miss from Vimperator/Vimium is being able to filter follow hints after typing f. This would mean the follow hints would have to be numbers instead of letters (#58 is related).

[rexkerr]

To add a text description to what the video does,

Since vimperator uses numbers instead of letters, any letters typed after the f (or F) are used to filter the possible matches, so if you have the following links, they would be numbered 1, 2, and 3. If you type ‘fh’ you’d get 1 and 2, and 3 (email us) would no longer be an option. If you typed ‘fhy’ only the first one would be highlighted, and since it’s the only match it would automatically be followed.

• Some hyperlink
• Click here
• email us

This is particularly useful on pages with a lot of densely packed links.

[stonewareslord]

I solved this by in Vimperator by setting the hintchar variable which defined which characters were used for hints and all other characters were used for filters.

This allows for great flexibility. I had mine set up so that capital letters were hints and lowercase letters were filters using one config line:

set hintchars=ASDFHJKL ...

And the hints were populated in order (first hint=A, second=S, …).