Description of problem:
Hi.  The rectangle selection tool in Rawhide's GIMP (which identifies itself as
2.2.12) doesn't work here -- as soon as the mouse-down happens a single-pixel
selection is created, and dragging the mouse while the button is still down
doesn't expand the selection.  

How reproducible:
Every time.

Steps to Reproduce:
1. Load GIMP
2. Create new document
3. Click and drag rectangle select, note that the selection is "stuck" on a
single pixel.

Additional info:
The other selection tools (e.g. circle) work fine.