This patch attempts to resolve #1008 (closed). Currently, after selecting a transform tool from the toolbox like rotate or scale, you have to click the canvas for the dialogue and handles to appear. If you select the tool from the menu instead, it automatically "activates".
This patch adds code that automatically activates a transform tool when selected, regardless of where it's selected from. It also re-activates when switching to a new image. An example of this can be seen below: