Occasionally trim the type cache

As loaded components are kept in a cache, they are never removed by the
garbage collector. So, if you periodically create new components, they
leak. This change adds a floating threshold for the number of
components. When that threshold is surpassed trimCache() is called and
unneeded components are removed.

Task-number: QTBUG-42055
Change-Id: I30e3e4ee287f6d34376713668009c67614a50e0c
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmltypeloader/data/trim_cache.qml b/tests/auto/qml/qqmltypeloader/data/trim_cache.qml
new file mode 100644
index 0000000000..74303977dd
--- /dev/null
+++ b/tests/auto/qml/qqmltypeloader/data/trim_cache.qml
@@ -0,0 +1,8 @@
+import QtQuick 2.2
+Rectangle
+{
+    objectName: "dings"
+    width: 100
+    height: 100
+    color: "blue"
+}