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docs: note scrollopt+=hor for trackpad users #20

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14 changes: 14 additions & 0 deletions README.md
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Expand Up @@ -184,6 +184,20 @@ The `highlight_mode` option controls how syntax highlighting is applied:
- **`treesitter`** (default): Full syntax highlighting via Neovim's treesitter. Changes are shown with background colors.
- **`difftastic`**: Minimal highlighting like the CLI. No syntax colors; changes are shown with foreground colors (green/red) to make diffs more prominent.

### Trackpad Scrolling

The panes scroll together vertically but not horizontally, because `'scrollbind'` only syncs the
axes listed in `'scrollopt'` and the default is `ver,jump`. With a trackpad, a sideways swipe moves
one pane alone. Add `hor` to `'scrollopt'` in your config to fix it:

```lua
vim.opt.scrollopt:append("hor")
```

```vim
set scrollopt+=hor
```

## Highlight Groups

Highlights automatically inherit from your colorscheme's semantic groups (`Added`, `Removed`, `Directory`, `Normal`) and update when you switch themes. Strong background colors are derived by blending the foreground color with your `Normal` background at 38% opacity. Line background colors use half of that opacity for a lighter full-line context.
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