I don't see any setting to control this, so the behavior seems unexpected/unintuitive.

• Create text file with the line oh hai > 1000 times

Scenario 1

• Single-click hai on line 1

Expected: All instances of hai are highlighted
Actual: Only the first 500 are highlighted (markers on scrollbar indicate similar)

Scenario 2

• Double-click hai on line 1

Expected: All instances of hai are highlighted
Actual: First 500 instances are bright-highlighted, the next 500 are dim-highlighted, and the rest are un-highlighted.

Version 0.10.3
Commit 783ecf841a2b21edca6d86853670cae89b4c244f
Date 2015-11-26T14:06:31.538Z
Shell 0.34.1
Renderer 45.0.2454.85
Node 4.1.1