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This dramatically reduces the calls to `getScreenRange` and, thus, makes `updateCursorsState` faster for scenarios where the number of cursors is elevated (e.g. editing, scrolling through a file, etc.).\r\n\r\nAlthough this code path will partially, and positively, be affected by the in-progress `DisplayLayer` redesign, I believe that reducing the number of cursors we need to iterate is still valuable in terms of performance and reduces the number of `getEnd()` queries we need to perform against `MarkerIndex`.\r\n\r\n#### Before\r\n![screen shot 2016-02-16 at 14 44 49](https://cloud.githubusercontent.com/assets/482957/13077922/29de3748-d4bc-11e5-9137-8dfb5d2be0f9.png)\r\n\r\n_(Total: `~ 1183ms`, benchmarks performed by editing 5000 lines, writing 5 letters)_\r\n\r\n\r\n#### After\r\n![screen shot 2016-02-16 at 14 46 45](https://cloud.githubusercontent.com/assets/482957/13077986/9dd66d82-d4bc-11e5-9cb5-9998620adc47.png)\r\n\r\n_(Total: `~ 98ms`, 12x faster :racehorse:)_\r\n\r\n/cc: 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