Fix dragging items out of map bounds

In 5.9.0 map items are clipped against the visible region.
This implies that their geometry is also clipped against
the visible region.
This is problematic in ::geometryChanged, since the old
geometry is always clipped in this way.

This patch clips items against a "projectable" region
instead, that is the part of the map that is in front
of the camera.

Since this can produce very large vertices, mapbox
earcut 3rd party library is pulled in, to replace
qTriangulate that only supports coordinates up to
1<<21.
This patch also contains a fix for earcut.hpp to make it
build also on QNX6.6

Task-number: QTBUG-61727
Change-Id: Iffc95fdae88fef982c1eb86db567b326b5e51057
Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Paolo Angelelli <paolo.angelelli@qt.io>

1 files changed, 15 insertions, 0 deletions

diff --git a/src/3rdparty/earcut/LICENSE b/src/3rdparty/earcut/LICENSE
new file mode 100644
index 00000000..8bafb577
--- /dev/null
+++ b/src/3rdparty/earcut/LICENSE
@@ -0,0 +1,15 @@
+ISC License
+
+Copyright (c) 2015, Mapbox
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.