[project panel] File extension color is incorrect after cancelling Rename

[redmunds]

1. Select a file in project tree
2. Context menu > Rename
3. Hit Esc key to cancel rename operation

Result
File extension color is same as name

Expected
File extension should be gray.

[jasonsanjose]

#3506 fix in progress

[RaymondLim]

You can also reproduce it by hitting enter key in step 3 to keep the same file name.

[RaymondLim]

Fix confirmed.