Add test to call setInputWindows twice

Currently, I'm observing some strange behaviour, where calling
setInputWindows twice results in the touchable region becoming empty.
Add this test to R to see what's going on, and potentially bisect on
this.

Bug: 143459140
Test: atest inputflinger_tests
Change-Id: Ia0acef5d4ee4acc29d20174fe44c9f94172ccd96

1 files changed, 5 insertions, 0 deletions

diff --git a/libs/ui/Region.cpp b/libs/ui/Region.cpp
index 82ce757d5a..e01309b679 100644
--- a/libs/ui/Region.cpp
+++ b/libs/ui/Region.cpp
@@ -224,6 +224,11 @@ Region& Region::operator = (const Region& rhs)
     validate(*this, "this->operator=");
     validate(rhs, "rhs.operator=");
 #endif
+    if (this == &rhs) {
+        // Already equal to itself
+        return *this;
+    }
+
     mStorage.clear();
     mStorage.insert(mStorage.begin(), rhs.mStorage.begin(), rhs.mStorage.end());
     return *this;