[PATCH v2] shell: moving drag surface refine

[Juan Zhao]

On Thu, 2012-08-02 at 12:01 -0400, Kristian Høgsberg wrote:
> We need to loop through the rectangles in the region and make sure at
> least one of them is at least boxsize wide and high.  Consider a
> common configuration:
> 
>      +------------+-------------------------------+
>      |            |                               |
>      |  LVDS1     |      DP1                      |
>      |            |                               |
>      |            |                               |
>      +------------+                               |
>                   |                               |
>                   |                               |
>                   |                               |
>                   |                               |
>                   +-------------------------------+
> 
> If you put a surface here:
> 
>      +------------+-------------------------------+
>      |            |                               |
>      |  LVDS1     |      DP1                      |
>      |            |                               |
>      |     +------++                              |
>      +-----|------+|                              |
>            | SURF ||                              |
>            |      ||                              |
>            +------++                              |
>                   |                               |
>                   +-------------------------------+
> 
> There will be two rectangles in the region, one really wide and low
> and one relaly tall and narrow.  While the extent of the region may be
> wide and tall, this may only leave a 1-pixel top edge and a 1-pixel
> right edge of the window on the screen.  So to prevent this, we need
> to make sure at least on of the rectangles in the region are at least
> boxsize wide and high. 

Yes, this should be a problem to be fixed. I woll go through the
rectangles inside.
I still think your suggestion about the pointer bounding box would be
better. 

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