Consider int range offset in truthy context

Author: herndlm

src/Analyser/TypeSpecifier.php

@@ -280,7 +280,7 @@ public function specifyTypesInCondition(
 						$sizeType = IntegerRangeType::createAllGreaterThan($leftType->getValue());
 					}
 				} elseif ($leftType instanceof IntegerRangeType) {
-					$sizeType = $leftType;
+					$sizeType = $leftType->shift($offset);
 				}
 
 				$specifiedTypes = $this->specifyTypesForCountFuncCall($expr->right, $argType, $sizeType, $context, $scope, $expr);
@@ -1061,23 +1061,14 @@ private function specifyTypesForCountFuncCall(FuncCall $countFuncCall, Type $typ
 
 				$arraySize = $type->getArraySize();
 				$isSize = $sizeType->isSuperTypeOf($arraySize);
-				if ($context->truthy()) {
-					if ($isSize->no()) {
-						return new NeverType();
-					}
-
-					$constArray = $this->turnListIntoConstantArray($type, $sizeType);
-					if ($constArray !== null) {
-						$type = $constArray;
-					}
+				if ($context->truthy() && $isSize->no()) {
+					return new NeverType();
 				}
-				if ($context->falsey()) {
-					if (!$isSize->yes()) {
-						return new NeverType();
-					}
+				if ($context->falsey() && !$isSize->yes()) {
+					return new NeverType();
 				}
 
-				return $type;
+				return $this->turnListIntoConstantArray($type, $sizeType) ?? $type;
 			});
 
 			return $this->create($countFuncCall->getArgs()[0]->value, $resultType, $context, $scope)->setRootExpr($rootExpr);

tests/PHPStan/Analyser/nsrt/bug-4700.php

@@ -41,9 +41,9 @@ function(array $array, int $count): void {
 	if (isset($array['e'])) $a[] = $array['e'];
 	if (count($a) > $count) {
 		assertType('int<2, 5>', count($a));
-		assertType('array{0: mixed~null, 1?: mixed~null, 2?: mixed~null, 3?: mixed~null, 4?: mixed~null}', $a);
+		assertType('list{0: mixed~null, 1: mixed~null, 2?: mixed~null, 3?: mixed~null, 4?: mixed~null}', $a);
 	} else {
-		assertType('0', count($a));
-		assertType('array{}', $a);
+		assertType('int<0, 5>', count($a)); // Could be int<0, 1>
+		assertType('array{}|array{0: mixed~null, 1?: mixed~null, 2?: mixed~null, 3?: mixed~null, 4?: mixed~null}', $a); // Could be array{}|array{0: mixed~null}
 	}
 };