0.84b1: Draw tool: Shadow not updated when changing colour

[helmut]

XnView 0.84 beta 1

When changing the colour of the text shadow, this colour change isn't applied immediately to the drawn text. All other changes to the shadow are applied right away.

To reproduce:
1. Open draw tool
2. Add some text to the image
3. In Text > Effects panel check "Shadow"
4. Change the colour of the shadow.
--> Changing the colour of the shadow will not take effect until making some other change to the shadow parameters (e.g. Offset X/Y).

[helmut]

Fixed in 0.84 b2.