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Fixes #803.

See #809.

Closes #807.

Although group names are case-insensitive:

- Vim's docs use NONE;
- the code already uses NONE elsewhere.

E.g., passing an empty group name to the sign argument linehl (e.g.,
"linehl=") causes the following error:

```
Error detected while processing /usr/home/0mp/.vim/plugged/vim-gitgutter/plugin/gitgutter.vim[96]..function gitgutter#highlight#define_signs[10]..<SNR>56_define_sign_line_highlights:
line    9:
E1249: Group name missing for linehl
```

This patch makes the those errors go away by passing "None" when no
group name is needed.

See #814, #607.

Fixes #801.

The --cc option is issued for merge conflicts.

See #789.

versions.

See #668.

This only applies to floating preview windows on Neovim.

Handles the following way of closing the floating preview:

- <Esc>
- Moving cursor
- 2<C-W>c (where 2 is the floating window's window number)
- <C-W><C-W> to move into and out of the floating window

Closes #786.

See #784.

This allows custom maps for closing the hunk preview window.

See #784.

See #784.

See #784.

See #396, #779.

The file name does not mean anything so it is unhelpful to show it.
Not showing it avoids the hit-enter prompt which can occur.

This bug was introduced by 9784226b in #708.  It had the effect of not
allowing an existing hunk preview window to increase in size for a
larger hunk (up to 'previewheight').

See #775.

Thanks @andymass for the patch.

See #769.

I would prefer to remove the statusline altogether in the hunk preview
window, making it consistent with the floating preview window.  However
I do not think that is possible; the best one can do is make it blank.

In da77e463 the function changed to be
consistent with GitGutterGetHunks(), i.e. to show "no data" if called in
a buffer for which gitgutter is inactive.

This function is mostly used in status lines.  GitGutter is inactive
when a popup window is open.  The commit mentioned above meant that when
a completion window was open, the hunk summary in the status line
changed to show no data.  It changed back again once the completion
window was closed, but the overall effect was a little distracting.

This commit reverts the change.

Closes #771.

Thanks to @sebastianmarkow for pointing this out.

Fixes #765.

Like `set shell=pwsh\ -NoLogo`.

See #718.