
The addition of incremental file loading in the file-list introduced an edge case in which the user could scroll off the file-list with hotkeys. This change implements the gr-cursor-manager to control file-list scrolling behavior. In addition, some interesting edge cases with the cursor-manager were uncovered during use -- these were also fixed. Change-Id: I936d4368058212c98684bc2617be2d98bdf6e41d