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	Fix types used in Hash() function used in tests. (#640)
Using `auto` seems to create a different output on different platforms. Notably it was observed that aarch64 compiles return a different value. Fix the type of the characters iterated through the string. Fixes #639 Signed-off-by: Henner Zeller <h.zeller@acm.org>
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			@@ -14,7 +14,7 @@ namespace ftxui {
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namespace {
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uint32_t Hash(const std::string s) {
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  uint32_t hash = 0;
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  for (auto c : s) {
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  for (uint8_t c : s) {
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    hash += c;
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    hash *= 7;
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  }
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@@ -37,7 +37,7 @@ TEST(CanvasTest, GoldPoint) {
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  });
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  Screen screen(30, 10);
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  Render(screen, element);
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  EXPECT_EQ(Hash(screen.ToString()), 2143518726);
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  EXPECT_EQ(Hash(screen.ToString()), 2085952774U) << screen.ToString();
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}
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TEST(CanvasTest, GoldPointColor) {
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@@ -52,7 +52,7 @@ TEST(CanvasTest, GoldPointColor) {
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  });
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  Screen screen(30, 10);
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  Render(screen, element);
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  EXPECT_EQ(Hash(screen.ToString()), 1264423298);
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  EXPECT_EQ(Hash(screen.ToString()), 2295070594U) << screen.ToString();
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}
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TEST(CanvasTest, GoldBlock) {
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@@ -70,7 +70,7 @@ TEST(CanvasTest, GoldBlock) {
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  });
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  Screen screen(30, 10);
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  Render(screen, element);
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  EXPECT_EQ(Hash(screen.ToString()), 3826174883);
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  EXPECT_EQ(Hash(screen.ToString()), 2625314979U) << screen.ToString();
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}
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TEST(CanvasTest, GoldBlockColor) {
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@@ -85,7 +85,7 @@ TEST(CanvasTest, GoldBlockColor) {
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  });
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  Screen screen(30, 10);
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  Render(screen, element);
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  EXPECT_EQ(Hash(screen.ToString()), 3048712696);
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  EXPECT_EQ(Hash(screen.ToString()), 8392696U) << screen.ToString();
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}
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TEST(CanvasTest, GoldText) {
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