Some small bugs fixing and improvements include --
- Clicking on canvas region should fold any unfolded panel.
- Fix active tool image display on tool changing.
- Empty text submission from the Text tool should switch to last active tool.
- Highlighting of active brush for some brushes isn't working...these brushes need to be renamed as handled in Activity.selectMode().
- ~~Fix dimension of the currently active tool, color, undo and redo box.~~
- Disable undo/redo button when undo/redo stack are empty.
More to be added based on reviews and testing.....