Pigments not showing colors past window height.

This is specific to color coding with any of the dot options (dot, square, gutter). The highlight options still work correctly.

After a recent update, pigments stopped showing colors after the first 52 *visible* lines of the file. An older install of atom (0.39 and 0.13) works just fine on the same files). This is specifically happening at line 52 with the font set to 12px. Changing the font size or line height move the break point up and down. Math works out to failing at 936 pixels or thereabouts, seemingly no more meaningful that 52 lines of text.

If the line height does not evenly divide into 936, then the break occurs mid-line with an alpha-box blow where the color breaks. Collapsing lines moves the break point down correspondingly.


This occurs for all file types tested so far (SCSS, CSS, HTML, PHP).

No idea if it is pigments or atom 1.19. Other packages are acting wonky, but usually with error popups.

```
Pigments 0.40.2
Atom 1.19.0
Windows 10 Pro 15063.502
```