Add letter hints for selecting instances of saved searches

[rodolf0]

Would it be feasible to provide letter hints while doing scrollback search for easier selection of snippets?

• Tmux has a similar plugin to this https://github.com/Morantron/tmux-fingers.
• Vim plugin easymotion has a related feature for jumping around too https://github.com/easymotion/vim-easymotion

How would this work?

1. When triggering a pre-configured search (as in https://wezfurlong.org/wezterm/scrollback.html#configuring-saved-searches), each highlight would be prefixed by an alphanumeric char. Example [a-z0-9]-<search-result>.
2. Pressing the keyboard key for that char/hint would copy the instance of the search result directly. (Possibly exiting search mode and pasting it too)

[wez]

someone previously mentioned https://github.com/fcsonline/tmux-thumbs and I think it would be great to have something like this integrated in our search functionality

[wez]

I just pushed the first draft at this kind of feature; it will show up in the nightly builds in about 20-30 minutes depending on the platform.

To activate, press: CTRLSHIFTSPACE

TODO:

• [x] Configurable alphabet
• [x] Configurable patterns
• [x] docs

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