Fix isPrintable for whitespace

Author: msimacek

graalpython/com.oracle.graal.python.test/src/tests/unittest_tags/test_unicode.txt

@@ -67,6 +67,7 @@
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_replace
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_replace_id
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_replace_overflow
+*graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_repr
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_resize
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_rfind
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_rindex

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/str/StringBuiltins.java

@@ -1851,7 +1851,7 @@ static boolean doGeneric(Object self,
     abstract static class IsPrintableNode extends PythonUnaryBuiltinNode {
         @TruffleBoundary
         private static boolean isPrintableChar(int i) {
-            return UCharacter.isPrintable(i);
+            return StringUtils.isPrintable(i);
         }
 
         @Specialization

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/str/StringUtils.java

@@ -45,6 +45,7 @@
 import org.graalvm.nativeimage.ImageInfo;
 
 import com.ibm.icu.lang.UCharacter;
+import com.ibm.icu.lang.UCharacterCategory;
 import com.ibm.icu.lang.UProperty;
 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
 
@@ -242,7 +243,22 @@ public static boolean isPrintable(int codepoint) {
 
     @TruffleBoundary
     private static boolean isPrintableICU(int codepoint) {
-        return UCharacter.isPrintable(codepoint);
+        // ICU's definition of printability is different from CPython, so we cannot use
+        // UCharacter.isPrintable
+        int category = UCharacter.getType(codepoint);
+        switch (category) {
+            case UCharacterCategory.CONTROL:
+            case UCharacterCategory.FORMAT:
+            case UCharacterCategory.SURROGATE:
+            case UCharacterCategory.PRIVATE_USE:
+            case UCharacterCategory.UNASSIGNED:
+            case UCharacterCategory.LINE_SEPARATOR:
+            case UCharacterCategory.PARAGRAPH_SEPARATOR:
+                return false;
+            case UCharacterCategory.SPACE_SEPARATOR:
+                return codepoint == ' ';
+        }
+        return true;
     }
 
     @TruffleBoundary