[arrayTools] fix sectRect boundary case

use '>' instead of '>=' when comparing intersection of two rectangles, so we don't skip boundary case when the two touch

Fixes #3352

Lib/fontTools/misc/arrayTools.py

@@ -208,7 +208,7 @@ def sectRect(rect1, rect2):
         min(xMax1, xMax2),
         min(yMax1, yMax2),
     )
-    if xMin >= xMax or yMin >= yMax:
+    if xMin > xMax or yMin > yMax:
         return False, (0, 0, 0, 0)
     return True, (xMin, yMin, xMax, yMax)
 

Tests/misc/arrayTools_test.py

@@ -89,6 +89,13 @@ def test_sectRect():
     assert rect == (5, 20, 20, 30)
 
 
+def test_sectRect_perpendicular():
+    # https://github.com/fonttools/fonttools/issues/3352
+    intersects, rect = sectRect((0.0, 0.0, 0.0, 1.0), (0.0, 0.5, 1.0, 0.5))
+    assert intersects
+    assert rect == (0.0, 0.5, 0.0, 0.5)
+
+
 def test_unionRect():
     assert unionRect((0, 10, 20, 30), (0, 40, 20, 50)) == (0, 10, 20, 50)