The rendering algorithm has been completely reviewed. The refresh method has been split into redraw and draw methods. The redraw method detects if a Widget needs to be redrawn based on the container dimension, the visibility of the Widget and some other parameters.

The redraw method calls the draw method which resizes the Widget's element. In case of a container Widget, it should also resize the container element of the descendant Widgets and call their redraw method. It is then up to the descendant Widgets to determine whether they need to be redrawn.

The zwt.ui.Dimension class was one of the main reasons for the bad rendering. Now dimension properties are cached in the object to improve performances (more than 50%).

There was some bugs impacting Opera and Webkit with the Tab bar. Basically Opera didn't positioned the lines correctly on vertical Tab bar and text was selected when selecting multiple tabs with Webkit. These issues has been fixed in this release.

The rendering algorithm of the Stack Panel wasn't perfect and some CSS settings wasn't taken correctly into account when displaying the panel. The panel is now correctly displayed.