Find on big files does not highlight every match

[williamokano]

• VSCode Version: 1.15.0
• OS Version: Linux Mint 18.1

Steps to Reproduce:

1. Open "very big" dataset (mine have 50625 lines, and sorry, can't distribute)
2. Perform a search on this very big dataset.

The find window will show "1 of 999+" instead of highlighting every match. The minimap also show only a few results, although there's at least one match every single line.

Reproduces without extensions: Yes

Observations:
If I click to navigate to the previous match, it will show ? of 999+ but it work perfectly, setting the cursor on the correct position on the last line of the "very big" file, but still don't highligthing the match.

[rebornix]

Duplicate of #496