Recompute winSize/borderSize to fix them when changing redirection.
Sufficient, but not always necessary. Add borderClip to damage on creation so that clients needn't guess. Fix API to FbDots functions to make PolyPoint work with screen_x/screen_y offsets Add debugging code to make sure no pictures are left pointing at freed pixmaps. "Can't" happen, but it did once. Change KdOffscreenArea structure to eliminate separate private structure, eliminate the ScreenPtr, change from doubly linked to singly linked list. Don't damage BackgroundNone windows on PW_BACKGROUND. Re-clip damage to borderClip in DamageSubtract.
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