From 1cf84307c36457315f7106a4fbf8589543d049f9 Mon Sep 17 00:00:00 2001
From: fvogel <fvogelnew1@free.fr>
Date: Sun, 17 Sep 2017 13:29:18 +0000
Subject: Fix [514ff64dd0]: canvas rotated text overlap detection not working

---
 generic/tkFont.c | 14 ++++++--------
 tests/font.test  | 10 ++++++++++
 2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/generic/tkFont.c b/generic/tkFont.c
index 4183686..86fdd87 100644
--- a/generic/tkFont.c
+++ b/generic/tkFont.c
@@ -3151,14 +3151,13 @@ TkIntersectAngledTextLayout(
 	cy[0] = cy[1] = chunkPtr->y - fontPtr->fm.ascent;
 	cx[1] = cx[2] = chunkPtr->x + chunkPtr->displayWidth;
 	cy[2] = cy[3] = chunkPtr->y + fontPtr->fm.descent;
-	if (	!PointInQuadrilateral(cx, cy, rx[0], ry[0]) ||
-		!PointInQuadrilateral(cx, cy, rx[1], ry[1]) ||
-		!PointInQuadrilateral(cx, cy, rx[2], ry[2]) ||
-		!PointInQuadrilateral(cx, cy, rx[3], ry[3])) {
-	    goto notReverseInside;
-	}
+	if (	PointInQuadrilateral(cx, cy, rx[0], ry[0]) &&
+		PointInQuadrilateral(cx, cy, rx[1], ry[1]) &&
+		PointInQuadrilateral(cx, cy, rx[2], ry[2]) &&
+		PointInQuadrilateral(cx, cy, rx[3], ry[3])) {
+            return 0;
+        }
     }
-    return 0;
 
     /*
      * If we're overlapping now, we must be partially in and out of at least
@@ -3166,7 +3165,6 @@ TkIntersectAngledTextLayout(
      * rectangle that is touching or crossing a line segment of a chunk.
      */
 
-  notReverseInside:
     chunkPtr = layoutPtr->chunks;
 
     for (i=0 ; i<layoutPtr->numChunks ; i++,chunkPtr++) {
diff --git a/tests/font.test b/tests/font.test
index 23e09c4..62afa5a 100644
--- a/tests/font.test
+++ b/tests/font.test
@@ -1956,6 +1956,16 @@ test font-31.6 {Tk_IntersectTextLayout procedure: ignore spaces at eol} -body {
     .t.c itemconfig text -width 0
     return $x
 } -result {}
+test font-31.7 {TkIntersectAngledTextLayout procedure: bug [514ff64dd0]} -body {
+    csetup "This is line one\nand line two\nand line three here"
+    .t.c itemconfigure text -angle 90
+    # Coordinates of the rectangle to check can be hardcoded:
+    # The goal of this test is to check whether the overlap detection algorithm
+    # works when the rectangle is entirely included in a chunk of the text layout.
+    # The text has been rotated 90 degrees around it's upper left corner,
+    # so it's enough to check with a small rectangle with small negative y coords.
+    .t.c find overlapping 5 -7 7 -5
+} -result {1}
 destroy .t.c
 
 
-- 
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