Performance improvements for Find, focused on the initial keystroke or two
when the number of results is usually very high:
- Batch tickmark creation (saves 120ms in med-size files like FindReplace)
- Cut off tickmark & inline highlighting when tons of search results found
(saves ~1 sec in huge files like codemirror.js)
Code review: use more consts in Find; remove unneeded single-tickmark API
Merge pull request #5303 from adobe/pflynn/find-highlight-perf

Performance improvements for initial keystrokes in Find