k-takata / vim / 364

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Fix a problem with 'breakindent' and 'showbreak'

When both 'breakindent' and 'showbreak' are set and 'briopt' includes "sbr",
a very long line that overflows a window may not shown correctly.

1. Create a window with the size 20x10.
   `:10new | 20vnew`
2. Set a very long line. (200 "a"s.)
   `200aa<Esc>`
3. Set some options.
   `:set breakindent breakindentopt=shift:2,sbr,min:18 showbreak=>`

   The text will be shown as:
   ```
   aaaaaaaaaaaaaaaaaaaa
   > aaaaaaaaaaaaaaaaaa
   > aaaaaaaaaaaaaaaaaa
   ...
   ```
4. Scroll one screen line.
   `:set scrolloff=5`
   `5gj`

   The text will be shown as:
   ```
   >aaaaaaaaaaaaaaaaaaa
   > aaaaaaaaaaaaaaaaaa
   > aaaaaaaaaaaaaaaaaa
   ...
   ```

   However, it should be:
   ```
   > aaaaaaaaaaaaaaaaaa
   > aaaaaaaaaaaaaaaaaa
   > aaaaaaaaaaaaaaaaaa
   ...
   ```

   Yank and some operations may not work properly as well.

4 of 4 new or added lines in 1 file covered. (100.0%)

108157 of 131622 relevant lines covered (82.17%)

787151.53 hits per line