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- Is completely separate from (and therefore does not overlap) another window (e.g.: 4 is separate from 2).
- Or, completely contains another window (e.g.: 1 completely contains 4).
- Or, is completely contained within another windows (e.g.: 4 is completely contained within 1).
Or, where an overlap occurs, no overlap of the top or bottom LEFT HAND CORNERS of the other window occurs. (e.g.: 4 overlaps 3, but does not overlap its top or bottom left hand corners).
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............................ ................................. ........... : : : 2 : : 1................................ : : : : : :................... : :: : : 3 : : : : : : : : : : : : : : 4 : : : : : : : : : : : : : : : : : : : :
..............................: : : : : : ::.................................. : :..........................: |
Note that window 1 does not conform to these rules. It overlaps the top and bottom left hand corners of window 3, and therefore could cause the top and bottom border areas of window 3 to "disappear".