When searching, selecting notes only draws upper-half of their contents

[JimZM]

To reproduce this bug:

1. create a note "note1" with content "aaa\nbbb\nccc" (as 3 lines)
2. create a note "note2" with content "AAA\nBBB\nCCC" (as 3 lines)
3. go to the search area, type "bbb"
4. press Up/Down to browse through these 2 notes

During step 4, Only the first 2 lines of each file will update on screen, even after waiting for 10+ seconds. However, switching to other app will immediately redraw the note correctly.

Tested with nvALT 2.2.8 (128), on macOS Sierra 10.12.6.