Correctly capture renaming variables

[emergenz]

Currently, renaming variables is incorrectly captured. The following is the log of renaming a variable to test.

2,1402,"src/extension.ts",2159,0,"",typescript,selection_mouse
3,5425,"src/extension.ts",3271,8,"t",typescript,content
4,5425,"src/extension.ts",3260,9,"t",typescript,content
5,5425,"src/extension.ts",2629,8,"t",typescript,content
6,5425,"src/extension.ts",2618,9,"t",typescript,content
7,5425,"src/extension.ts",2294,8,"t",typescript,content
8,5425,"src/extension.ts",2283,9,"t",typescript,content
9,5425,"src/extension.ts",2161,8,"t",typescript,content
10,5425,"src/extension.ts",2150,9,"t",typescript,content