Fix middle expression of `for` loop to accept not only operators

servers/rendering/shader_language.cpp

@@ -8061,7 +8061,7 @@ Error ShaderLanguage::_parse_block(BlockNode *p_block, const FunctionInfo &p_fun
 			if (!expr) {
 				return ERR_PARSE_ERROR;
 			}
-			is_condition = expr->type == Node::NODE_TYPE_OPERATOR && expr->get_datatype() == TYPE_BOOL;
+			is_condition = expr->get_datatype() == TYPE_BOOL;
 
 			if (expr->type == Node::NODE_TYPE_OPERATOR) {
 				OperatorNode *op = static_cast<OperatorNode *>(expr);
@@ -8077,7 +8077,7 @@ Error ShaderLanguage::_parse_block(BlockNode *p_block, const FunctionInfo &p_fun
 			if (p_block->block_type == BlockNode::BLOCK_TYPE_FOR_CONDITION) {
 				if (tk.type == TK_COMMA) {
 					if (!is_condition) {
-						_set_error(RTR("The middle expression is expected to be a boolean operator."));
+						_set_error(RTR("The middle expression is expected to have a boolean data type."));
 						return ERR_PARSE_ERROR;
 					}
 					continue;
@@ -8106,7 +8106,7 @@ Error ShaderLanguage::_parse_block(BlockNode *p_block, const FunctionInfo &p_fun
 				return ERR_PARSE_ERROR;
 			}
 			if (p_block->block_type == BlockNode::BLOCK_TYPE_FOR_CONDITION && !is_condition) {
-				_set_error(RTR("The middle expression is expected to be a boolean operator."));
+				_set_error(RTR("The middle expression is expected to have a boolean data type."));
 				return ERR_PARSE_ERROR;
 			}
 		}