Draw tool - pencil draw - undo - tool changes

[golemus]

I am not sure if this is a bug or intended behavior but I dont know any other program that does this.

Way to replicate:

- open photo
- open draw tool
- click pencil tool (or some other tools like rectangle, ellipse, text?)
- draw something with the tool
- press ctrl-Z to undo the drawing.

observer behaviour:
tool changes to "select tool"

expected behaviour:
tool remains the same which has been selected.